Portable electronic device, optical imaging system, and lens assembly

ABSTRACT

An optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens, sequentially disposed from an object side, wherein the first to fifth lenses are spaced apart from each other by predetermined distances along an optical axis in a paraxial region, the first lens and the second lens each have a non-circular shape when viewed in an optical axis direction, and the optical imaging system satisfies 0.62398&lt;ZS 1/ ZS 2 &lt;1.36318, where ZS 1  is a ratio of an area of an object-side surface of the first lens to a distance from the object-side surface of the first lens to an imaging plane of an image sensor, and ZS 2  is a ratio of an area of an object-side surface of the second lens to a distance from the object-side surface of the second lens to the imaging plane of the image sensor.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No.16/449,616 filed on Jun. 24, 2019, which claims the benefit under 35U.S.C. 119(a) of Korean Patent Application No. 10-2018-0098221 filed onAug. 22, 2018, Korean Patent Application No. 10-2018-0110439 filed onSep. 14, 2018, and Korean Patent Application No. 10-2019-0025946 filedon Mar. 6, 2019, in the Korean Intellectual Property Office, the entiredisclosures of which are incorporated herein by reference for allpurposes.

BACKGROUND 1. Field

This disclosure relates to a portable electronic device, an opticalimaging system, and a lens assembly.

2. Description of the Background

A camera module may be used in portable electronic devices such assmartphones. Recently, miniaturization of a camera module mounted on theportable electronic devices has been demanded due to demand forminiaturization of the portable electronic devices.

However, when a size of a camera module is simply reduced, there may bea problem that performance of the camera modules may deteriorate.Therefore, research for reducing the size of the camera module may berequired while maintaining or improving the performance of the cameramodule.

In general, since a lens of the camera module is substantially circular,and an image sensor of the camera module is rectangular, not all lightrefracted by the lens may be captured on the image sensor.

Accordingly, a method of reducing the size of the camera module byremoving unnecessary portions from the lens to reduce the size of thelens may be considered.

However, when only a portion of the lens is simply removed, opticalperformance of the lens may be deteriorated to lower quality of thecaptured image.

The above information is presented as background information only toassist with an understanding of the present disclosure. No determinationhas been made, and no assertion is made, as to whether any of the abovemight be applicable as prior art with regard to the disclosure.

SUMMARY

This Summary is provided to introduce a selection of concepts in asimplified form that are further described below in the DetailedDescription. This Summary is not intended to identify key features oressential features of the claimed subject matter, nor is it intended tobe used as an aid in determining the scope of the claimed subjectmatter.

In one general aspect, an optical imaging system includes a first lens,a second lens, a third lens, a fourth lens, and a fifth lens,sequentially disposed from an object, wherein the first to fifth lensesare spaced apart from each other by predetermined distances along anoptical axis in a paraxial region, the first lens and the second lenseach have a non-circular shape when viewed in an optical axis direction,and the optical imaging system satisfies 0.62398<ZS1/ZS2<1.36318, whereZS1 is a ratio of an area of an object-side surface of the first lens toa distance on the optical axis from the object-side surface of the firstlens to an imaging plane of an image sensor, and ZS2 is a ratio of anarea of an object-side surface of the second lens to a distance on theoptical axis from the object-side surface of the second lens to theimaging plane of the image sensor.

The optical imaging system may further satisfy 1.607 mm<ZS1<2.014 mm.

The optical imaging system may further satisfy 1.838 mm<ZS2<2.303 mm.

The first lens may include a first side surface and a second sidesurface, each having an arc shape when viewed in the optical axisdirection, and a third side surface and a fourth side surface connectingthe first side surface and the second side surface, and the opticalimaging system may further satisfy 73.9 degrees<α<106.4 degrees, where αis an angle between a first imaginary line connecting the optical axisand a connection point between the first side surface and the fourthside surface and a second imaginary line connecting the optical axis anda connection point between the second side surface and the fourth sidesurface.

The optical imaging system may further satisfy 0.599<AR<0.799, where aline segment connecting the third side surface and the fourth sidesurface through the optical axis in a shortest distance represents aminor axis, a line segment connecting the first side surface and thesecond side surface through the optical axis and perpendicular to theminor axis represents a major axis, and AR is a ratio of a length of theminor axis to a length of the major axis.

The third to fifth lenses may each include a non-circular shape whenviewed in the optical axis direction, and the optical imaging system mayfurther satisfy 92.4 degrees<α<121.0 degrees.

The optical imaging system may further satisfy 1.351 mm<ZS1<1.811 mm and1.545 mm<ZS2<2.07 mm.

The optical imaging system may further include a sixth lens and aseventh lens. The third to seventh lenses may each have a non-circularshape when viewed in the optical axis direction. The optical imagingsystem may further satisfy 79.4 degrees<α<126.4 degrees,

The optical imaging system may further satisfy 1.106 mm<ZS1<1.828 mm and1.194 mm<ZS2<1.975 mm.

The optical imaging system may further satisfy 86.2 degrees<α<116.0degrees.

The optical imaging system may further satisfy 1.1 mm<ZS1<1.438 mm and1.258 mm<ZS2<1.644 mm.

A length of a relative long side of the image sensor may be 1.5 times ormore a length of a relative short side of the image sensor. The opticalimaging system may further satisfy 101.3 degrees<α<128.6 degrees.

The optical imaging system may further satisfy 0.916 mm<ZS1<1.284 mm and1.048 mm<ZS2<1.468 mm.

The optical imaging system may further satisfy 109.2 degrees<α<135.4degrees.

The optical imaging system may further satisfy 0.920 mm<ZS1<1.355 mm and0.994 mm<ZS2<1.464 mm.

The optical imaging system may be a portable electronic device, furtherincluding a display. The image sensor may be configured to convert lightincident through the first through fifth lenses to an electric signaland the display may be configured to display an image based on theelectric signal.

In another general aspect, a lens assembly includes a first lens, asecond lens, a third lens, a fourth lens, a fifth lens, and an imagesensor, sequentially disposed from an object side, wherein the first tofifth lenses are spaced apart from each other by predetermined distancesalong an optical axis in a paraxial region, the first lens and thesecond lens each have a non-circular shape when viewed in an opticalaxis direction, the first lens and the second lens each include anoptical portion for refracting light and a flange portion extendingalong a periphery of at least a portion of the optical portion, and theoptical imaging system satisfies 0.73598<ZS′1/ZS′2<1.37987, where ZS′1is a ratio of an area of the optical portion on an object-side surfaceof the first lens to a distance on the optical axis from the object-sidesurface of the first lens to an imaging plane of the image sensor, andZS′2 is a ratio of an area of the optical portion on an object-sidesurface of the second lens to a distance on the optical axis from theobject-side surface of the second lens to the imaging plane of the imagesensor.

In another general aspect, a portable electronic device includes a firstlens, a second lens, a third lens, a fourth lens, a fifth lens, and animage sensor configured to convert light incident through the firstthrough fifth lenses to an electric signal, sequentially disposed alongan optical axis from an object side, a reflection member disposed infront of the first to fifth lenses and configured to change a travelingdirection of light from a thickness direction of the portable electronicdevice to an optical axis direction, and a display unit configured todisplay an image based on the electric signal, wherein the first lensand the second lens each have a non-circular shape when viewed in theoptical axis direction, the first lens and the second lens each includean optical portion for refracting light and a flange portion extendingalong a periphery of a portion of the optical portion, and wherein theflange portion is disposed on opposite sides of the optical portionspaced apart in a direction perpendicular to the thickness direction ofthe portable electronic device.

Other features and aspects will be apparent from the following detaileddescription, the drawings, and the claims.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a perspective view of a portable electronic device accordingto an embodiment of the present disclosure.

FIG. 2 is a schematic perspective view of an optical imaging systemaccording to an embodiment of the present disclosure.

FIG. 3 is a schematic cross-sectional view of a lens assembly accordingto an embodiment of the present disclosure.

FIGS. 4 and 5 are plan views of a first lens of an optical imagingsystem according to an embodiment of the present disclosure.

FIGS. 6 and 7 are plan views illustrating a non-circular lens of a lensassembly according to an embodiment of the present disclosure.

FIG. 8 is a schematic plan view of an image sensor according to anembodiment of the present disclosure.

FIG. 9 is a configuration diagram of a first embodiment of an opticalimaging system.

FIGS. 10 and 11 are curves illustrating aberration characteristics ofthe optical imaging system illustrated in FIG. 9.

FIG. 12 is a configuration diagram of a second embodiment of an opticalimaging system.

FIGS. 13 and 14 are curves illustrating aberration characteristics ofthe optical imaging system illustrated in FIG. 12.

FIG. 15 is a configuration diagram of a third embodiment of an opticalimaging system.

FIGS. 16 and 17 are curves illustrating aberration characteristics ofthe optical imaging system illustrated in FIG. 15.

FIG. 18 is a configuration diagram of a fourth embodiment of an opticalimaging system.

FIGS. 19 and 20 are curves illustrating aberration characteristics ofthe optical imaging system illustrated in FIG. 18.

FIG. 21 is a configuration diagram of a fifth embodiment of an opticalimaging system.

FIGS. 22 and 23 are curves illustrating aberration characteristics ofthe optical imaging system illustrated in FIG. 21.

Throughout the drawings and the detailed description, the same referencenumerals refer to the same elements. The drawings may not be to scale,and the relative size, proportions, and depiction of elements in thedrawings may be exaggerated for clarity, illustration, and convenience.

DETAILED DESCRIPTION

The following detailed description is provided to assist the reader ingaining a comprehensive understanding of the methods, apparatuses,and/or systems described herein. However, various changes,modifications, and equivalents of the methods, apparatuses, and/orsystems described herein will be apparent after an understanding of thisdisclosure. For example, the sequences of operations described hereinare merely examples, and are not limited to those set forth herein, butmay be changed as will be apparent after an understanding of thisdisclosure, with the exception of operations necessarily occurring in acertain order. Also, descriptions of features that are known in the artmay be omitted for increased clarity and conciseness.

The features described herein may be embodied in different forms, andare not to be construed as being limited to the examples describedherein. Rather, the examples described herein have been provided merelyto illustrate some of the many possible ways of implementing themethods, apparatuses, and/or systems described herein that will beapparent after an understanding of this disclosure. Hereinafter, whileembodiments of the present disclosure will be described in detail withreference to the accompanying drawings, it is noted that examples arenot limited to the same.

Throughout the specification, when an element, such as a layer, region,or substrate, is described as being “on,” “connected to,” or “coupledto” another element, it may be directly “on,” “connected to,” or“coupled to” the other element, or there may be one or more otherelements intervening therebetween. In contrast, when an element isdescribed as being “directly on,” “directly connected to,” or “directlycoupled to” another element, there can be no other elements interveningtherebetween. Also, when one element is “electrically connected to”another element, they may be physically connected to each other, or theymay be not in physical contact with each other.

As used herein, the term “and/or” includes any one and any combinationof any two or more of the associated listed items; likewise, “at leastone of” includes any one and any combination of any two or more of theassociated listed items.

Although terms such as “first,” “second,” and “third” may be used hereinto describe various members, components, regions, layers, or sections,these members, components, regions, layers, or sections are not to belimited by these terms. Rather, these terms are only used to distinguishone member, component, region, layer, or section from another member,component, region, layer, or section. Thus, a first member, component,region, layer, or section referred to in examples described herein mayalso be referred to as a second member, component, region, layer, orsection without departing from the teachings of the examples.

Spatially relative terms such as “above,” “upper,” “below,” and “lower”may be used herein for ease of description to describe one element'srelationship to another element as shown in the figures. Such spatiallyrelative terms are intended to encompass different orientations of thedevice in use or operation in addition to the orientation depicted inthe figures. For example, if the device in the figures is turned over,an element described as being “above” or “upper” relative to anotherelement will then be “below” or “lower” relative to the other element.Thus, the term “above” encompasses both the above and below orientationsdepending on the spatial orientation of the device. The device may alsobe oriented in other ways (for example, rotated 90 degrees or at otherorientations), and the spatially relative terms used herein are to beinterpreted accordingly.

The terminology used herein is for describing various examples only, andis not to be used to limit the disclosure. The articles “a,” “an,” and“the” are intended to include the plural forms as well, unless thecontext clearly indicates otherwise. The terms “comprises,” “includes,”and “has” specify the presence of stated features, numbers, operations,members, elements, and/or combinations thereof, but do not preclude thepresence or addition of one or more other features, numbers, operations,members, elements, and/or combinations thereof.

Due to manufacturing techniques and/or tolerances, variations of theshapes shown in the drawings may occur. Thus, the examples describedherein are not limited to the specific shapes shown in the drawings, butinclude changes in shape that occur during manufacturing.

The features of the examples described herein may be combined in variousways as will be apparent after an understanding of this disclosure.Further, although the examples described herein have a variety ofconfigurations, other configurations are possible as will be apparentafter an understanding of this disclosure.

Herein, it is noted that use of the term “may” with respect to anexample or embodiment, e.g., as to what an example or embodiment mayinclude or implement, means that at least one example or embodimentexists where such a feature is included or implemented while allexamples and embodiments are not limited thereto.

One or more examples of a portable electronic device, an optical imagingsystem, and a lens assembly that may have reduced size and improvedperformance are described herein.

FIG. 1 is a perspective view of a portable electronic device accordingto an embodiment of the present disclosure.

Referring to FIG. 1, a portable electronic device 1000 according to anexemplary embodiment of the present disclosure may be a portableelectronic device, such as a mobile communications terminal, asmartphone, or a tablet PC, including a camera module 1.

As illustrated in FIGS. 1, 2, and 3, the camera module 1 may be mountedon the portable electronic device 1000 to photograph a subject. Thecamera module 1 may include a lens assembly 2.

The lens assembly 2 may include an optical imaging system 3 and an imagesensor S, and may further include a reflection member R (see FIG. 3).The optical imaging system 3 may include a plurality of lenses.

In an embodiment of the present disclosure, the camera module 1 may beconfigured such that an optical axis (a z axis) of the plurality oflenses may be disposed in a direction, perpendicular to a thicknessdirection of the portable electronic device 1000 (a Y axis direction,i.e., a direction from a front surface of the portable electronic device1000 to a rear surface thereof, or in an opposite direction).

For example, the optical axis (Z-axis) of the plurality of lensesprovided in the camera module 1 may be formed in a width direction or alongitudinal direction of the portable electronic device 1000.

Therefore, even when the camera module 1 has functions such as AutoFocusing (hereinafter, referring to as “AF”), Optical Zoom (hereinafter,referring to as “Zoom”), and Optical Image Stabilization (hereinafter,referring to as “OIS”), it may be prevented from a further increase in athickness of the portable electronic device 1000. Therefore, theportable electronic device 1000 may be miniaturized.

The camera module 1 according to an embodiment of the present disclosuremay include at least one of the AF, Zoom, and OIS functions.

In the case of the camera module 1 having the AF, Zoom, and OISfunctions, a size of the camera module 1 may be increased compared to asize of a conventional camera module.

As the size of the camera module 1 increases, the size of the portableelectronic device 1000 on which the camera module 1 is mounted may bealso affected. Therefore, there is a limitation to the miniaturizationof the portable electronic device 1000.

For example, the camera module needs to change a focal length of theoptical imaging system 3 in order to realize the Zoom function. In thiscase, space may be required to move at least a portion of the pluralityof lenses.

When the optical axis (the z axis) of the plurality of lenses is formedin the thickness direction (the Y axis direction) of the portableelectronic device 1000, a thickness of the portable electronic device1000 may also increase. In a case in which the thickness of the portableelectronic device 1000 does not increase, space for moving the lensesmay be not sufficient. Therefore, it may be difficult to implement theZoom function.

In order to realize the AF and OIS functions, an actuator for moving theoptical imaging system 3 in the optical axis direction, and in adirection, perpendicular to the optical axis, should be provided. Whenthe optical axis (the z axis) is provided in the thickness direction(the Y axis direction) of the portable electronic device 1000, thethickness of the portable electronic device 1000 may increase due to theactuator for moving the optical imaging system 3.

Since the camera module 1 according to an embodiment of the presentdisclosure may be arranged such that the optical axis (the z axis) ofthe plurality of lenses is disposed perpendicular to the thicknessdirection (the Y axis direction) of the portable electronic device 1000,the thickness of the portable electronic device 1000 may be preventedfrom being increased, even when the camera module 1 having the OISfunction is mounted on the portable electronic device 1000. Therefore,the portable electronic device 1000 may be miniaturized.

FIG. 2 is a schematic perspective view of an optical imaging systemaccording to an embodiment of the present disclosure, and FIG. 3 is aschematic cross-sectional view of a lens assembly according to anembodiment of the present disclosure.

Referring to FIGS. 2 and 3, a lens assembly 2 according to an embodimentof the present disclosure may include an optical imaging system 3including a plurality of lenses L1, L2, L3, L4, and L5, an infraredlight blocking filter IR, and an image sensor S, and may further includea reflection member R.

The reflection member R may be disposed in front of the plurality oflenses L1, L2, L3, L4, and L5, and may be configured to change atraveling direction of light. Therefore, a path of light incident on thecamera module 1 may be changed by the reflection member R.

For example, the light incident on the camera module 1 may be changed inthe traveling direction by the reflection member R to face the pluralityof lenses L1, L2, L3, L4, and L5.

The reflection member R may be a mirror or a prism that reflects light.

The infrared light blocking filter IR may function to block light in aninfrared light region of light incident through the plurality of lensesL1, L2, L3, L4, and L5.

The image sensor S may convert light incident through the plurality oflenses L1, L2, L3, L4, and L5 into electric signals. For example, theimage sensor S may be an electric charge coupled device (CCD) or acomplementary metal-oxide semiconductor (CMOS).

The portable electronic device 1000 may include a display unit 5disposed on a surface of the portable electronic apparatus 1000 todisplay an image based on the electric signals of the image sensor S.For example, the display unit 5 may include a liquid crystal display(LCD), a light-emitting diode (LED), an organic light-emitting diode(OLED), etc., or combinations thereof.

The plurality of lenses L1, L2, L3, L4, and L5 may include a first lensL1, a second lens L2, a third lens L3, a fourth lens L4, and a fifthlens L5, sequentially disposed in numerical order in a direction from anobject side of the optical imaging system to an image side thereof. Sixor more of lenses may be included when necessary.

The plurality of lenses L1, L2, L3, L4, and L5 may be spaced apart fromneighboring lenses by a predetermined distance.

At least a portion of the plurality of lenses L1, L2, L3, L4, and L5 mayhave a non-circular planar shape. For example, the first lens L1 and thesecond lens L2 may be formed in a non-circular shape, and the third lensL3 to the fifth lens L5 may be formed in a circular shape (see FIG. 2).

Here, the term “circular shape” refers to not only a complete circle,but also a partly cut shape in which a gate portion of a plasticinjection lens is cut off.

Therefore, the third lens L3 to the fifth lens L5 may be a partly cutshape in which a portion of a circle is cut off by cutting the gateportion, which may be a moving passage of a resin material, for example,an injection portion for injection molding formation of the lens.

Here, the term “non-circular shape” refers that the lens may be notcircular in a region other than the gate portion of the plasticinjection lens.

The first lens L1 may have four side surfaces, and two side surfacesamong them may be formed to face each other. Further, the side surfacesfacing each other may have shapes corresponding to each other.

For example, when viewed in the optical axis direction, the first sidesurface and the second side surface of the first lens L1 may have an arcshape, and the third side surface and the fourth side surface may have asubstantially straight shape. The gate portion, which may be a movingpassage of the resin material, may be formed on either the first sidesurface or the second side surface.

A shape of the second lens L2 may be substantially similar to a shape ofthe first lens L1, and the first lens L1 will be described below forconvenience of explanation.

All of the plurality of lenses L1, L2, L3, L4, and L5 may have anon-circular planar shape.

FIGS. 4 and 5 are plan views of a first lens of an optical imagingsystem according to an embodiment of the present disclosure.

Referring to FIG. 4, a first lens L1 may have four side surfaces, andtwo side surfaces among them may be formed to face each other. Further,the side surfaces facing each other may have shapes corresponding toeach other.

For example, when viewed in the optical axis direction, a first sidesurface 21 and a second side surface 22 of the first lens L1 may have anarc shape, and a third side surface 23 and a fourth side surface 24 mayhave a substantially straight shape.

The third side surface 23 and the fourth side surface 24 may connect thefirst side surface 21 and the second side surface 22, respectively.

The third side surface 23 and the fourth side surface 24 may besymmetrical about the optical axis, and may be formed to be parallel toeach other.

The first lens L1 may have a major axis (a) and a minor axis (b). Forexample, as illustrated in FIG. 4, when viewed in the optical axisdirection, a line segment connecting the third side surface 23 and thefourth side surface 24 through the optical axis (the z axis) in ashortest distance represents a minor axis (b), and a line segmentconnecting the first side surface 21 and the second side surface 22through the optical axis (the z axis) and perpendicular to the minoraxis (b) represents a major axis (a).

The first lens L1 may include an optical portion 10 and a flange portion30.

The optical portion 10 may be a portion in which optical performance ofthe first lens L1 is exerted. For example, light reflected from asubject may be refracted while passing through the optical portion 10.

The optical portion 10 may have positive or negative refractive power,and may have a spherical or non-spherical shape.

The flange portion 30 may be a portion for fixing the first lens L1 toanother component, for example, a lens barrel or the second lens L2.

The flange portion 30 may extend around at least a portion of theoptical portion 10, and may be formed integrally with the opticalportion 10.

The optical portion 10 and the flange portion 30 may be formed in anon-circular shape. For example, the optical portion 10 and the flangeportion 30 may be non-circular when viewed in the optical axis direction(see FIG. 4). Alternatively, the optical portion 10 may have a circularshape, and the flange portion 30 may have a non-circular shape.

Referring to FIG. 5, an optical portion 10 may include a first edge 11,a second edge 12, a third edge 13, and a fourth edge 14. The first edge11 and the second edge 12 may be located opposite to each other, and thethird edge 13 and the fourth edge 14 may be located opposite to eachother.

The third edge 13 and the fourth edge 14 may connect the first edge 11and the second edge 12, respectively.

When viewed in the optical axis direction, the first edge 11 and thesecond edge 12 may have an arc shape, and the third edge 13 and thefourth edge 14 may have a substantially straight shape.

The third edge 13 and the fourth edge 14 may be symmetrical about theoptical axis (the z axis), and may be formed to be parallel to eachother.

The optical portion 10 may have a major axis (c) and a minor axis (d).For example, when viewed in the optical axis direction, a line segmentconnecting the third edge 13 and the fourth edge 14 through the opticalaxis (the z axis) in a shortest distance represents a minor axis (d),and a line segment connecting the first edge 11 and the second edge 12through the optical axis (the z axis) and perpendicular to the minoraxis (d) represents a major axis (c).

A flange portion 30 may include a first flange portion 31 and a secondflange portion 32. The first flange portion 31 may extend from the firstedge 11 of the optical portion 10, and the second flange portion 32 mayextend from the second edge 12 of the optical portion 10.

The first edge 11 of the optical portion 10 may refer to a portionadjacent to the first flange portion 31, and the second edge 12 of theoptical portion 10 may refer to a portion adjacent to the second flangeportion 32.

The third edge 13 of the optical portion 10 may refer to a side surfaceof the optical portion 10 in which the flange portion 30 is not formed,and the fourth edge 14 of the optical portion 10 may refer to the otherside surface of the optical portion 10 in which the flange portion 30 isnot formed.

The first lens L1 may be made of a plastic material, and may beinjection-molded through a mold. Here, the third edge 13 and the fourthedge 14 of the first lens L1 according to an embodiment of the presentdisclosure may be formed to have the above-described shape during aninjection molding operation, but may not be formed by cutting a portionof the lens after the injection molding operation.

When a portion of the lens is removed after the injection moldingoperation, the lens may be deformed by force applied to the lens in thecourse of the injection molding operation. When the lens is deformed,optical performance of the lens may inevitably be changed.

Since the first lens L1 according to an embodiment of the presentdisclosure is formed in a non-circular shape when the first lens L1 isinjected, a size of the first lens L1 may be reduced, and performance ofthe first lens L1 may be ensured.

FIGS. 6 and 7 are plan views illustrating a non-circular lens of a lensassembly according to an embodiment of the present disclosure.

Referring to FIG. 6, in an embodiment of the present disclosure, atleast a portion of a lens of a lens assembly 2 may be formed in anon-circular shape. For example, the non-circular lens may have a firstside surface 21, a second side surface 22, a third side surface 23, anda fourth side surface 24. When viewed in the optical axis direction, thefirst side surface 21 and the second side surface 22 may have an arcshape, and the third side surface 23 and the fourth side surface 24 mayhave a substantially straight shape.

The gate portion, which may be a moving passage of a resin material, maybe formed on either the first side surface 21 or the second side surface22, but is not illustrated in FIG. 6.

Referring to FIG. 6, a dashed line refers to a first imaginary line (P1)connecting an optical axis (a z axis) and a connection point between afirst side surface 21 and a fourth side surface 24 (or a third sidesurface 23) of a non-circular lens, and a second imaginary line (P2)connecting an optical axis (a z axis) and a connection point between asecond side surface 22 and a fourth side surface 24 (or a third sidesurface 23) of a non-circular lens. A dashed-dotted line refers to anangle (α) between the two imaginary lines.

In an embodiment of the present disclosure, ZS is defined as a ratio ofan area of an object-side surface of a non-circular lens to the totallength.

${{ZSn} = \frac{An}{1n}},\left( {{n = 1},2,3,4,5,6,7,\ldots} \right)$

A refers to an area of an object-side surface of a non-circular lens.The area of the object-side surface refers to the sum of areas of anoptical portion 10 and a flange portion 30.

n refers to a constant for designating a specific lens. For example, A1refers to an area of an object-side surface of a first lens L1, and A2refers to an area of an object-side surface of a second lens L2.

I refers to the total track length. The total track length refers to adistance of an optical axis from an object-side surface of anon-circular lens to an imaging plane of an image sensor S. For example,l1 refers to a distance of an optical axis from an object-side surfaceof a first lens L1 to an imaging plane of an image sensor S, l2 refersto a distance of an optical axis from an object-side surface of a secondlens L2 to an imaging plane of an image sensor S, and l3 refers to adistance of an optical axis from an object-side surface of a third lensL3 to an imaging plane of an image sensor S (see FIG. 3).

α refers to an angle between a first imaginary line (P1) connecting anoptical axis (a z axis) and a connection point between a first sidesurface 21 and a fourth side surface 24 and a second imaginary line (P2)connecting an optical axis (a z axis) and a connection point between asecond side surface 22 and a fourth side surface 24. For example, α1refers to an angle between the first imaginary line (P1) and the secondimaginary line (P2) of the first lens L1, and α2 refers to an anglebetween the first imaginary line (P1) and the second imaginary line (P2)of the second lens L2.

Referring to FIG. 7, in an embodiment of the present disclosure, anoptical portion 10 may be formed in a non-circular shape. For example,the optical portion 10 may include a first edge 11, a second edge 12, athird edge 13, and a fourth edge 14. When viewed in the optical axisdirection, the first edge 11 and the second edge 12 may have an arcshape, and the third edge 13 and the fourth edge 14 may have asubstantially straight shape.

Referring to FIG. 7, a dotted line refers to an area through which lightactually passes. A dashed line refers to a first imaginary line (P1′)connecting an optical axis (a z axis) and a connection point between afirst edge 11 and a fourth edge 14 (or a third edge 13) of an opticalportion 10, and a second imaginary line (P2′) connecting an optical axis(a z axis) and a connection point between a second edge 12 and a fourthedge 14 (or a third edge 13) of an optical portion 10. A dashed-dottedline refers to an angle (α′) between the two imaginary lines.

In an embodiment of the present disclosure, ZS′ is defined as a ratio ofan area of an optical portion 10 to the total length.

${{{ZS}^{\prime}n} = \frac{A^{\prime}n}{1n}},\left( {{n = 1},2,3,4,5,6,7,\ldots} \right)$

A′ refers to an area of an optical portion 10 in an object-side surfaceof a non-circular lens.

n refers to a constant for designating a specific lens. For example, A′1refers to an area of an optical portion 10 in an object-side surface ofa first lens L1, and A′2 refers to an area of an optical portion 10 inan object-side surface of a second lens L2.

l refers to the total track length. The total track length refers to adistance of an optical axis from an object-side surface of anon-circular lens to an imaging plane of an image sensor S. For example,l1 refers to a distance of an optical axis from an object-side surfaceof a first lens L1 to an imaging plane of an image sensor S, l2 refersto a distance of an optical axis from an object-side surface of a secondlens L2 to an imaging plane of an image sensor S, and l3 refers to adistance of an optical axis from an object-side surface of a third lensL3 to an imaging plane of an image sensor S (see FIG. 3).

α′ refers to an angle between a first imaginary line (P1′) connecting anoptical axis (a z axis) and a connection point between a first edge 11and a fourth edge 14 and a second imaginary line (P2′) connecting anoptical axis (a z axis) and a connection point between a second edge 12and a fourth edge 14. For example, α′1 refers to an angle between thefirst imaginary line (P1′) and the second imaginary line (P2′) of thefirst lens L1, and α′2 refers to an angle between the first imaginaryline and the second imaginary line of the second lens L2.

As a first embodiment of a lens assembly 2, a case in which a first lensL1 and a second lens L2 among a plurality of lenses are non-circular andthe other lenses are circular will be described. A plurality of lensesincludes a first lens L1 to a fifth lens L5. In the first embodiment ofthe lens assembly 2, the lens assembly 2 has a fixed focal length. Also,the lens assembly 2 has an F-number (hereinafter, referred to as “FNO”)of 2.8. FNO refers to a constant indicating brightness of a lensassembly 2.

The first lens L1 satisfies the following Conditional Expression 1-1,and the second lens L2 satisfies the following Conditional Expression1-2.

1.607 mm<ZS1<2.014 mm   [Conditional Expression 1-1]

1.838 mm<ZS2<2.303 mm   [Conditional Expression 1-2]

In Conditional Expression 1-1, ZS1 refers to a ratio (A1/l1) of an area(A1) of an object-side surface of the first lens L1 to a distance (l1)of the optical axis from the object-side surface of the first lens L1 toan imaging plane of an image sensor S. The area (A1) of the object-sidesurface of the first lens L1 refers to the total area of the object-sidesurface of the first lens L1 (the sum of an area of an optical portionand an area of a flange portion).

In Conditional Expression 1-2, ZS2 refers to a ratio (A2/l2) of an area(A2) of an object-side surface of the second lens L2 to a distance (12)of the optical axis from the object-side surface of the second lens L2to an imaging plane of an image sensor S. The area (A2) of theobject-side surface of the second lens L2 refers to the total area ofthe object-side surface of the second lens L2 (the sum of an area of anoptical portion and an area of a flange portion).

In the first embodiment, the first lens L1 and the second lens L2satisfy at least one of the following Conditional Expressions 1-3 and1-4.

73.9 degrees<α<106.4 degrees   [Conditional Expression 1-3]

0.599<AR<0.799   [Conditional Expression 1-4]

In Conditional Expression 1-3, a refers to an angle between the firstimaginary line (P1) and the second imaginary line (P2) of the first lensL1.

In Conditional Expression 1-4, AR refers to an aspect ratio of theobject-side surface of the first lens L1. AR refers to a ratio (b/a) ofa length of the minor axis (b) of the first lens L1 to a length of themajor axis (a) of the first lens L1.

An angle between the first imaginary line and the second imaginary lineof the second lens L2, and an aspect ratio of the object-side surface ofthe second lens L2 refer to the same characteristics as previouslydescribed with regard to the first lens L1.

The first lens L1 satisfies at least one of the following ConditionalExpressions 1-5 to 1-7.

1.218 mm<ZS′1<1.477 mm   [Conditional Expression 1-5]

61.6 degrees<α′1<97.5 degrees   [Conditional Expression 1-6]

0.659<AR′1<0.859   [Conditional Expression 1-7]

In Conditional Expression 1-5, ZS′1 refers to a ratio (A′1/l1) of anarea (A′1) of an object-side surface of the first lens L1 to a distance(l1) of the optical axis from the object-side surface of the first lensL1 to an imaging plane of an image sensor S. The area (A′1) of theobject-side surface of the first lens L1 refers to an area of theoptical portion 10 in the object-side surface of the first lens L1.

In Conditional Expression 1-6, α′1 refers to an angle between a firstimaginary line (P1′) connecting an optical axis and a connection pointbetween a first edge 11 and a fourth edge 14 of the optical portion 10of the first lens L1 and a second imaginary line (P2′) connecting anoptical axis and a connection point between a second edge 12 and afourth edge 14 of the optical portion 10 of the first lens L1.

In Conditional Expression 1-7, AR′1 refers to an aspect ratio of theoptical portion 10 in the object-side surface of the first lens L1. AR′1refers to a ratio (d/c) of a length of the minor axis (d) of the opticalportion 10 of the first lens L1 to a length of the major axis (c) of theoptical portion 10 of the first lens L1.

The second lens L2 satisfies at least one of the following ConditionalExpressions 1-8 to 1-10.

1.221 mm<ZS′2<1.404 mm   [Conditional Expression 1-8]

34.7 degrees<α′2<82.0 degrees   [Conditional Expression 1-9]

0.755<AR′2<0.955   [Conditional Expression 1-10]

In Conditional Expression 1-8, ZS′2 refers to a ratio (A′2/l2) of anarea (A′2) of an object-side surface of the second lens L2 to a distance(l2) of the optical axis from the object-side surface of the second lensL2 to an imaging plane of an image sensor S. The area (A′2) of theobject-side surface of the second lens L2 refers to an area of theoptical portion in the object-side surface of the second lens L2.

In Conditional Expression 1-9, a′2 refers to an angle between a firstimaginary line connecting an optical axis and a connection point betweena first edge 11 and a fourth edge 14 of the optical portion of thesecond lens L2 and a second imaginary line connecting an optical axisand a connection point between a second edge 12 and a fourth edge 14 ofthe optical portion of the second lens L2.

In Conditional Expression 1-10, AR′2 refers to an aspect ratio of theoptical portion in the object-side surface of the second lens L2. AR′2refers to a ratio of a length of the minor axis of the optical portionof the second lens L2 to a length of the major axis of the opticalportion of the second lens L2.

The following Table 1 illustrates an embodiment of a lens assembly 2satisfying the above Conditional Expressions 1-1 to 1-10. In thefollowing Tables 1 to 6, a unit of the total length is mm.

TABLE 1 Optical Portion of Total Track Object-Side Surface Object-SideSurface Lens Length (I) AR α A ZS AR′ α′ A′ ZS′ L1 14.98 0.699 91.26827.333 1.825 0.759 81.226 20.362 1.359 L2 13.1 0.699 91.268 27.333 2.0870.855 62.578 17.400 1.328

The first lens L1 and the second lens L2 are configured to be alignedwith respect to each other. For example, the first lens L1 and thesecond lens L2 are coupled to each other to align their optical axes.

A flange portion of an image-side surface of the first lens L1 and aflange portion of an object-side surface of the second lens L2 have aconcavo-convex structure, respectively, and the concavo-convex structureof the first lens L1 and the concavo-convex structure of the second lensL2 are configured to be coupled to each other such that the optical axisis aligned.

As a second embodiment of a lens assembly 2, a case in which all of aplurality of lenses are non-circular will be described. The plurality oflenses include a first lens L1 to a fifth lens L5. In the secondembodiment of the lens assembly 2, the lens assembly 2 has a fixed focallength. Also, the lens assembly 2 has an FNO of 2.8. FNO refers to aconstant indicating brightness of a lens assembly 2.

The first lens L1 satisfies the following Conditional Expression 2-1,the second lens L2 satisfies the following Conditional Expression 2-2,the third lens L3 satisfies the following Conditional Expression 2-3,the fourth lens L4 satisfies the following Conditional Expression 2-4,and the fifth lens L5 satisfies the following Conditional Expression2-5.

1.351 mm<ZS1<1.811 mm   [Conditional Expression 2-1]

1.545 mm<ZS2<2.070 mm   [Conditional Expression 2-2]

1.869 mm<ZS3<2.504 mm   [Conditional Expression 2-3]

1.994 mm<ZS4<2.672 mm   [Conditional Expression 2-4]

2.318 mm<ZS5<3.107 mm   [Conditional Expression 2-5]

In Conditional Expression 2-1, ZS1 refers to a ratio (A1/l1) of an area(A1) of an object-side surface of the first lens L1 to a distance (l1)of the optical axis from the object-side surface of the first lens L1 toan imaging plane of an image sensor S. The area (A1) of the object-sidesurface of the first lens L1 refers to the total area of the object-sidesurface of the first lens L1 (the sum of an area of an optical portionand an area of a flange portion).

In Conditional Expression 2-2, ZS2 refers to a ratio (A2/l2) of an area(A2) of an object-side surface of the second lens L2 to a distance (l2)of the optical axis from the object-side surface of the second lens L2to an imaging plane of an image sensor S. The area (A2) of theobject-side surface of the second lens L2 refers to the total area ofthe object-side surface of the second lens L2 (the sum of an area of anoptical portion and an area of a flange portion).

In Conditional Expression 2-3, ZS3 refers to a ratio (A3/l3) of an area(A3) of an object-side surface of the third lens L3 to a distance (l3)of the optical axis from the object-side surface of the third lens L3 toan imaging plane of an image sensor S. The area (A3) of the object-sidesurface of the third lens L3 refers to the total area of the object-sidesurface of the third lens L3 (the sum of an area of an optical portionand an area of a flange portion).

In Conditional Expression 2-4, ZS4 refers to a ratio (A4/l4) of an area(A4) of an object-side surface of the fourth lens L4 to a distance (l4)of the optical axis from the object-side surface of the fourth lens L4to an imaging plane of an image sensor S. The area (A4) of theobject-side surface of the fourth lens L4 refers to the total area ofthe object-side surface of the fourth lens L4 (the sum of an area of anoptical portion and an area of a flange portion).

In Conditional Expression 2-5, ZS5 refers to a ratio (A5/l5) of an area(A5) of an object-side surface of the fifth lens L5 to a distance (l5)of the optical axis from the object-side surface of the fifth lens L5 toan imaging plane of an image sensor S. The area (A5) of the object-sidesurface of the fifth lens L5 refers to the total area of the object-sidesurface of the fifth lens L5 (the sum of an area of an optical portionand an area of a flange portion).

In the second embodiment, the first lens L1 to the fifth lens L5 satisfyat least one of the following Conditional Expressions 2-6 and 2-7.

92.4 degrees<α<121.0 degrees   [Conditional Expression 2-6]

0.492<AR<0.692   [Conditional Expression 2-7]

In Conditional Expression 2-6, α refers to an angle between the firstimaginary line (P1) and the second imaginary line (P2) of the first lensL1.

In Conditional Expression 2-7, AR refers to an aspect ratio of theobject-side surface of the first lens L1. AR refers to a ratio of alength of the minor axis (b) of the first lens L1 to a length of themajor axis (a) of the first lens L1.

An angle between the first imaginary line and the second imaginary lineof the second lens L2 to the fifth lens L5, and an aspect ratio of theobject-side surface of the second lens L2 to the fifth lens L5 refer tothe same characteristics as previously described with regard to thefirst lens L1.

The first lens L1 satisfies at least one of the following ConditionalExpressions 2-8 to 2-10.

1.013 mm<ZS′1<1.322 mm   [Conditional Expression 2-8]

86.0 degrees<α′1<115.8 degrees   [Conditional Expression 2-9]

0.531<AR′1<0.731   [Conditional Expression 2-10]

In Conditional Expression 2-8, ZS′1 refers to a ratio (A1/l1) of an area(A′1) of an object-side surface of the first lens L1 to a distance (l1)of the optical axis from the object-side surface of the first lens L1 toan imaging plane of an image sensor S. The area (A′1) of the object-sidesurface of the first lens L1 refers to an area of the optical portion 10in the object-side surface of the first lens L1.

In Conditional Expression 2-9, α′1 refers to an angle between a firstimaginary line (P1′) connecting an optical axis and a connection pointbetween a first edge 11 and a fourth edge 14 of the optical portion 10of the first lens L1 and a second imaginary line (P2′) connecting anoptical axis and a connection point between a second edge 12 and afourth edge 14 of the optical portion 10 of the first lens L1.

In Conditional Expression 2-10, AR′1 refers to an aspect ratio of theoptical portion 10 in the object-side surface of the first lens L1. AR′1refers to a ratio of a length of the minor axis (d) of the opticalportion 10 of the first lens L1 to a length of the major axis (c) of theoptical portion 10 of the first lens L1.

The second lens L2 satisfies at least one of the following ConditionalExpressions 2-11 to 2-13.

1.032 mm<ZS′2<1.284 mm   [Conditional Expression 2-11]

71.7 degrees<α′2<104.7 degrees   [Conditional Expression 2-12]

0.611<AR′2<0.811   [Conditional Expression 2-13]

In Conditional Expression 2-11, ZS′2 refers to a ratio (A′2/l2) of anarea (A′2) of an object-side surface of the second lens L2 to a distance(l2) of the optical axis from the object-side surface of the second lensL2 to an imaging plane of an image sensor S. The area (A′2) of theobject-side surface of the second lens L2 refers to an area of theoptical portion in the object-side surface of the second lens L2.

In Conditional Expression 2-12, α′2 refers to an angle between a firstimaginary line connecting an optical axis and a connection point betweena first edge and a fourth edge of the optical portion of the second lensL2 and a second imaginary line connecting an optical axis and aconnection point between a second edge and a fourth edge of the opticalportion of the second lens L2.

In Conditional Expression 2-13, AR′2 refers to an aspect ratio of theoptical portion in the object-side surface of the second lens L2. AR′2refers to a ratio of a length of the minor axis of the optical portionof the second lens L2 to a length of the major axis of the opticalportion of the second lens L2.

The third lens L3 satisfies at least one of the following ConditionalExpressions 2-14 to 2-16.

0.926 mm<ZS′3<1.011 mm   [Conditional Expression 2-14]

0 degree<α′3<68.5 degrees   [Conditional Expression 2-15]

0.827<AR′3<1.000   [Conditional Expression 2-16]

In Conditional Expression 2-14, ZS′3 refers to a ratio (A′3/l3) of anarea (A′3) of an object-side surface of the third lens L3 to a distance(l3) of the optical axis from the object-side surface of the third lensL3 to an imaging plane of an image sensor S. The area (A′3) of theobject-side surface of the third lens L3 refers to an area of an opticalportion in the object-side surface of the third lens L3.

In Conditional Expression 2-15, a′3 refers to an angle between a firstimaginary line connecting an optical axis and a connection point betweena first edge and a fourth edge of the optical portion of the third lensL3 and a second imaginary line connecting an optical axis and aconnection point between a second edge and a fourth edge of the opticalportion of the third lens L3.

In Conditional Expression 2-16, AR′3 refers to an aspect ratio of theoptical portion in the object-side surface of the third lens L3. AR′3refers to a ratio of a length of the minor axis of the optical portionof the third lens L3 to a length of the major axis of the opticalportion of the third lens L3.

The fourth lens L4 satisfies at least one of the following ConditionalExpressions 2-17 to 2-19.

0.950 mm<ZS′4<1.016 mm   [Conditional Expression 2-17]

0 degree<α′4<62.5 degrees   [Conditional Expression 2-18]

0.855<AR′4<1.000   [Conditional Expression 2-19]

In Conditional Expression 2-17, ZS'4 refers to a ratio (A′4/l4) of anarea (A′4) of an object-side surface of the fourth lens L4 to a distance(l4) of the optical axis from the object-side surface of the fourth lensL4 to an imaging plane of an image sensor S. The area (A′4) of theobject-side surface of the fourth lens L4 refers to an area of anoptical portion in the object-side surface of the fourth lens L4.

In Conditional Expression 2-18, α′4 refers to an angle between a firstimaginary line connecting an optical axis and a connection point betweena first edge and a fourth edge of the optical portion of the fourth lensL4 and a second imaginary line connecting an optical axis and aconnection point between a second edge and a fourth edge of the opticalportion of the fourth lens L4.

In Conditional Expression 2-19, AR′4 refers to an aspect ratio of theoptical portion in the object-side surface of the fourth lens L4. AR′4refers to a ratio of a length of the minor axis of the optical portionof the fourth lens L4 to a length of the major axis of the opticalportion of the fourth lens L4.

The fifth lens L5 satisfies at least one of the following ConditionalExpressions 2-20 to 2-22.

1.095 mm<ZS′5<1.166 mm   [Conditional Expression 2-20]

0 degree<α′5<61.1 degrees   [Conditional Expression 2-21]

0.861<AR′5<1.000   [Conditional Expression 2-22]

In Conditional Expression 2-20, ZS′5 refers to a ratio (A′5/l5) of anarea (A′5) of an object-side surface of the fifth lens L5 to a distance(l5) of the optical axis from the object-side surface of the fifth lensL5 to an imaging plane of an image sensor S. The area (A′5) of theobject-side surface of the fifth lens L5 refers to an area of an opticalportion in the object-side surface of the fifth lens L5.

In Conditional Expression 2-21, α′5 refers to an angle between a firstimaginary line connecting an optical axis and a connection point betweena first edge and a fourth edge of the optical portion of the fifth lensL5 and a second imaginary line connecting an optical axis and aconnection point between a second edge and a fourth edge of the opticalportion of the fifth lens L5.

In Conditional Expression 2-22, AR′5 refers to an aspect ratio of theoptical portion in the object-side surface of the fifth lens L5. AR′5refers to a ratio of a length of the minor axis of the optical portionof the fifth lens L5 to a length of the major axis of the opticalportion of the fifth lens L5.

The following Table 2 illustrates an embodiment of a lens assembly 2satisfying the above Conditional Expressions 2-1 to 2-22.

TABLE 2 Optical Portion of Total Track Object-Side Surface Object-SideSurface Lens Length (I) AR α A ZS AR′ α′ A′ ZS′ L1 14.98 0.592 107.35023.838 1.591 0.631 101.695 17.612 1.176 L2 13.1 0.592 107.350 23.8381.820 0.711 89.406 15.291 1.167 L3 10.83 0.592 107.350 23.838 2.2010.927 44.172 10.692 0.987 L4 10.15 0.592 107.350 23.838 2.349 0.95534.606 10.197 1.005 L5 8.73 0.592 107.350 23.838 2.731 0.961 32.06310.086 1.155

The first lens L1 and the second lens L2 are configured to be alignedwith respect to each other. For example, the first lens L1 and thesecond lens L2 are coupled to each other to align their optical axes.

A flange portion of an image-side surface of the first lens L1 and aflange portion of an object-side surface of the second lens L2 have aconcavo-convex structure, respectively, and the concavo-convex structureof the first lens L1 and the concavo-convex structure of the second lensL2 are configured to be coupled to each other such that the optical axisis aligned.

As a third embodiment of a lens assembly 2, a case in which all of aplurality of lenses are non-circular will be described. The plurality oflenses include a first lens L1 to a seventh lens L7. In the thirdembodiment of the lens assembly 2, the lens assembly 2 has a variablefocal length. In this case, the lens assembly 2 of the third embodimentmay change a focal length of the lens assembly 2 by moving at least aportion of the lenses to change a distance between the lenses.

Also, the lens assembly 2 has an FNO between 3.0 and 4.0. FNO refers toa constant indicating brightness of a lens assembly 2.

The first lens L1 satisfies the following Conditional Expression 3-1,the second lens L2 satisfies the following Conditional Expression 3-2,the third lens L3 satisfies the following Conditional Expression 3-3,the fourth lens L4 satisfies the following Conditional Expression 3-4,the fifth lens L5 satisfies the following Conditional Expression 3-5,the sixth lens L6 satisfies the following Conditional Expression 3-6,and the seventh lens L7 satisfies the following Conditional Expression3-7.

1.106 mm<ZS1<1.828 mm   [Conditional Expression 3-1]

1.194 mm<ZS2<1.975 mm   [Conditional Expression 3-2]

1.385 mm<ZS3<2.289 mm   [Conditional Expression 3-3]

1.559 mm<ZS4<2.576 mm   [Conditional Expression 3-4]

1.765 mm<ZS5<2.919 mm   [Conditional Expression 3-5]

2.754 mm<ZS6<4.552 mm   [Conditional Expression 3-6]

3.361 mm<ZS7<5.556 mm   [Conditional Expression 3-7]

In Conditional Expression 3-1, ZS1 refers to a ratio (A1/l1) of an area(A1) of an object-side surface of the first lens L1 to a distance (l1)of the optical axis from the object-side surface of the first lens L1 toan imaging plane of an image sensor S. The area (A1) of the object-sidesurface of the first lens L1 refers to the total area of the object-sidesurface of the first lens L1 (the sum of an area of an optical portionand an area of a flange portion).

In Conditional Expression 3-2, ZS2 refers to a ratio (A2/l2) of an area(A2) of an object-side surface of the second lens L2 to a distance (l2)of the optical axis from the object-side surface of the second lens L2to an imaging plane of an image sensor S. The area (A2) of theobject-side surface of the second lens L2 refers to the total area ofthe object-side surface of the second lens L2 (the sum of an area of anoptical portion and an area of a flange portion).

In Conditional Expression 3-3, ZS3 refers to a ratio (A3/l3) of an area(A3) of an object-side surface of the third lens L3 to a distance (l3)of the optical axis from the object-side surface of the third lens L3 toan imaging plane of an image sensor S. The area (A3) of the object-sidesurface of the third lens L3 refers to the total area of the object-sidesurface of the third lens L3 (the sum of an area of an optical portionand an area of a flange portion).

In Conditional Expression 3-4, ZS4 refers to a ratio (A4/l4) of an area(A4) of an object-side surface of the fourth lens L4 to a distance (l4)of the optical axis from the object-side surface of the fourth lens L4to an imaging plane of an image sensor S. The area (A4) of theobject-side surface of the fourth lens L4 refers to the total area ofthe object-side surface of the fourth lens L4 (the sum of an area of anoptical portion and an area of a flange portion).

In Conditional Expression 3-5, ZS5 refers to a ratio (A5/l5) of an area(A5) of an object-side surface of the fifth lens L5 to a distance (l5)of the optical axis from the object-side surface of the fifth lens L5 toan imaging plane of an image sensor S. The area (A5) of the object-sidesurface of the fifth lens L5 refers to the total area of the object-sidesurface of the fifth lens L5 (the sum of an area of an optical portionand an area of a flange portion).

In Conditional Expression 3-6, ZS6 refers to a ratio (A6/l6) of an area(A6) of an object-side surface of the sixth lens L6 to a distance (l6)of the optical axis from the object-side surface of the sixth lens L6 toan imaging plane of an image sensor S. The area (A6) of the object-sidesurface of the sixth lens L6 refers to the total area of the object-sidesurface of the sixth lens L6 (the sum of an area of an optical portionand an area of a flange portion).

In Conditional Expression 3-7, ZS7 refers to a ratio (A7/l7) of an area(A7) of an object-side surface of the seventh lens L7 to a distance (l7)of the optical axis from the object-side surface of the seventh lens L7to an imaging plane of an image sensor S. The area (A7) of theobject-side surface of the seventh lens L7 refers to the total area ofthe object-side surface of the seventh lens L7 (the sum of an area of anoptical portion and an area of a flange portion).

In the third embodiment, the first lens L1 to the seventh lens L7satisfy at least one of the following Conditional Expressions 3-8 and3-9.

79.4 degrees<α<126.4 degrees   [Conditional Expression 3-8]

0.451<AR<0.769   [Conditional Expression 3-9]

In Conditional Expression 3-8, α refers to an angle between the firstimaginary line (P1) and the second imaginary line (P2) of the first lensL1.

In Conditional Expression 3-9, AR refers to an aspect ratio of theobject-side surface of the first lens L1. AR refers to a ratio of alength of the minor axis (b) of the first lens L1 to a length of themajor axis (a) of the first lens L1.

An angle between the first imaginary line and the second imaginary lineof the second lens L2 to the seventh lens L7, and an aspect ratio of theobject-side surface of the second lens L2 to the seventh lens L7 referto the same characteristics as previously described with regard to thefirst lens L1.

The first lens L1 satisfies at least one of the following ConditionalExpressions 3-10 to 3-12.

0.616 mm<ZS′1<1.066 mm   [Conditional Expression 3-10]

0 degree<α′1<106.7 degrees   [Conditional Expression 3-11]

0.597<AR′1<1.0   [Conditional Expression 3-11]

In Conditional Expression 3-10, ZS′1 refers to a ratio (A1/l1) of anarea (A′1) of an object-side surface of the first lens L1 to a distance(l1) of the optical axis from the object-side surface of the first lensL1 to an imaging plane of an image sensor S. The area (A′1) of theobject-side surface of the first lens L1 refers to an area of theoptical portion 10 in the object-side surface of the first lens L1.

In Conditional Expression 3-11, α′1 refers to an angle between a firstimaginary line (P1′) connecting an optical axis and a connection pointbetween a first edge 11 and a fourth edge 14 of the optical portion 10of the first lens L1 and a second imaginary line (P2′) connecting anoptical axis and a connection point between a second edge 12 and afourth edge 14 of the optical portion 10 of the first lens L1.

In Conditional Expression 3-12, AR′1 refers to an aspect ratio of theoptical portion 10 in the object-side surface of the first lens L1. AR′1refers to a ratio of a length of the minor axis (d) of the opticalportion 10 of the first lens L1 to a length of the major axis (c) of theoptical portion 10 of the first lens L1.

The second lens L2 satisfies at least one of the following ConditionalExpressions 3-13 to 3-15.

0.616 mm<ZS′2<1.061 mm   [Conditional Expression 3-13]

0 degree<α′2<100.7 degrees   [Conditional Expression 3-14]

0.638<AR′2<1.0   [Conditional Expression 3-15]

In Conditional Expression 3-13, ZS′2 refers to a ratio (A′2/l2) of anarea (A′2) of an object-side surface of the second lens L2 to a distance(l2) of the optical axis from the object-side surface of the second lensL2 to an imaging plane of an image sensor S. The area (A′2) of theobject-side surface of the second lens L2 refers to an area of theoptical portion in the object-side surface of the second lens L2.

In Conditional Expression 3-14, α′2 refers to an angle between a firstimaginary line connecting an optical axis and a connection point betweena first edge and a fourth edge of the optical portion of the second lensL2 and a second imaginary line connecting an optical axis and aconnection point between a second edge and a fourth edge of the opticalportion of the second lens L2.

In Conditional Expression 3-15, AR′2 refers to an aspect ratio of theoptical portion in the object-side surface of the second lens L2. AR′2refers to a ratio of a length of the minor axis of the optical portionof the second lens L2 to a length of the major axis of the opticalportion of the second lens L2.

The third lens L3 satisfies at least one of the following ConditionalExpressions 3-16 to 3-18.

0.796 mm<ZS′3<1.383 mm   [Conditional Expression 3-16]

0 degree<α′3<109.3 degrees   [Conditional Expression 3-17]

0.579<AR′3<1.000   [Conditional Expression 3-18]

In Conditional Expression 3-16, ZS′3 refers to a ratio (A′3/l3) of anarea (A′3) of an object-side surface of the third lens L3 to a distance(l3) of the optical axis from the object-side surface of the third lensL3 to an imaging plane of an image sensor S. The area (A′3) of theobject-side surface of the third lens L3 refers to an area of an opticalportion in the object-side surface of the third lens L3.

In Conditional Expression 3-17, α′3 refers to an angle between a firstimaginary line connecting an optical axis and a connection point betweena first edge and a fourth edge of the optical portion of the third lensL3 and a second imaginary line connecting an optical axis and aconnection point between a second edge and a fourth edge of the opticalportion of the third lens L3.

In Conditional Expression 3-18, AR′3 refers to an aspect ratio of theoptical portion in the object-side surface of the third lens L3. AR′3refers to a ratio of a length of the minor axis of the optical portionof the third lens L3 to a length of the major axis of the opticalportion of the third lens L3.

The fourth lens L4 satisfies at least one of the following ConditionalExpressions 3-19 to 3-21.

0.782 mm<ZS′4<1.346 mm   [Conditional Expression 3-19]

0 degree<α′4<98.6 degrees   [Conditional Expression 3-20]

0.652<AR′4<1.000   [Conditional Expression 3-21]

In Conditional Expression 3-19, ZS′4 refers to a ratio (A′4/l4) of anarea (A′4) of an object-side surface of the fourth lens L4 to a distance(l4) of the optical axis from the object-side surface of the fourth lensL4 to an imaging plane of an image sensor S. The area (A′4) of theobject-side surface of the fourth lens L4 refers to an area of anoptical portion in the object-side surface of the fourth lens L4.

In Conditional Expression 3-20, α′4 refers to an angle between a firstimaginary line connecting an optical axis and a connection point betweena first edge and a fourth edge of the optical portion of the fourth lensL4 and a second imaginary line connecting an optical axis and aconnection point between a second edge and a fourth edge of the opticalportion of the fourth lens L4.

In Conditional Expression 3-21, AR′4 refers to an aspect ratio of theoptical portion in the object-side surface of the fourth lens L4. AR′4refers to a ratio of a length of the minor axis of the optical portionof the fourth lens L4 to a length of the major axis of the opticalportion of the fourth lens L4.

The fifth lens L5 satisfies at least one of the following ConditionalExpressions 3-22 to 3-24.

0.844 mm<ZS′5<1.451 mm   [Conditional Expression 3-22]

0 degree<a′5<94.7 degrees   [Conditional Expression 3-23]

0.678<AR′5<1.000   [Conditional Expression 3-24]

In Conditional Expression 3-22, ZS′5 refers to a ratio (A′5/l5) of anarea (A′5) of an object-side surface of the fifth lens L5 to a distance(l5) of the optical axis from the object-side surface of the fifth lensL5 to an imaging plane of an image sensor S. The area (A′5) of theobject-side surface of the fifth lens L5 refers to an area of an opticalportion in the object-side surface of the fifth lens L5.

In Conditional Expression 3-23, α′5 refers to an angle between a firstimaginary line connecting an optical axis and a connection point betweena first edge and a fourth edge of the optical portion of the fifth lensL5 and a second imaginary line connecting an optical axis and aconnection point between a second edge and a fourth edge of the opticalportion of the fifth lens L5.

In Conditional Expression 3-24, AR′5 refers to an aspect ratio of theoptical portion in the object-side surface of the fifth lens L5. AR′5refers to a ratio of a length of the minor axis of the optical portionof the fifth lens L5 to a length of the major axis of the opticalportion of the fifth lens L5.

The sixth lens L6 satisfies at least one of the following ConditionalExpressions 3-25 to 3-27.

1.438 mm<ZS′6<2.477 mm   [Conditional Expression 3-25]

0 degree<α′6<101.7 degrees   [Conditional Expression 3-26]

0.631<AR′6<1.0   [Conditional Expression 3-27]

In Conditional Expression 3-25, ZS′6 refers to a ratio (A′6/l6) of anarea (A′6) of an object-side surface of the sixth lens L6 to a distance(l6) of the optical axis from the object-side surface of the sixth lensL6 to an imaging plane of an image sensor S. The area (A′6) of theobject-side surface of the sixth lens L6 refers to an area of an opticalportion in the object-side surface of the sixth lens L6.

In Conditional Expression 3-26, α′6 refers to an angle between a firstimaginary line connecting an optical axis and a connection point betweena first edge and a fourth edge of the optical portion of the sixth lensL6 and a second imaginary line connecting an optical axis and aconnection point between a second edge and a fourth edge of the opticalportion of the sixth lens L6.

In Conditional Expression 3-27, AR′6 refers to an aspect ratio of theoptical portion in the object-side surface of the sixth lens L6. AR′6refers to a ratio of a length of the minor axis of the optical portionof the sixth lens L6 to a length of the major axis of the opticalportion of the sixth lens L6.

The seventh lens L7 satisfies at least one of the following ConditionalExpressions 3-28 to 3-30.

1.915 mm<ZS′7<3.323 mm   [Conditional Expression 3-28]

0 degree<α′7<108.5 degrees   [Conditional Expression 3-29]

0.584<AR′7<1.0   [Conditional Expression 3-30]

In Conditional Expression 3-28, ZS′7 refers to a ratio (A′7/l7) of anarea (A′7) of an object-side surface of the seventh lens L7 to adistance (l7) of the optical axis from the object-side surface of theseventh lens L7 to an imaging plane of an image sensor S. The area (A′7)of the object-side surface of the seventh lens L7 refers to an area ofan optical portion in the object-side surface of the seventh lens L7.

In Conditional Expression 3-29, α′7 refers to an angle between a firstimaginary line connecting an optical axis and a connection point betweena first edge and a fourth edge of the optical portion of the seventhlens L7 and a second imaginary line connecting an optical axis and aconnection point between a second edge and a fourth edge of the opticalportion of the seventh lens L7.

In Conditional Expression 3-30, AR′7 refers to an aspect ratio of theoptical portion in the object-side surface of the seventh lens L7. AR′7refers to a ratio of a length of the minor axis of the optical portionof the seventh lens L7 to a length of the major axis of the opticalportion of the seventh lens L7.

The following Table 3 illustrates an embodiment of the lens assembly 2satisfying the above Conditional Expressions 3-1 to 3-30. In anembodiment of the present disclosure, the lens assembly 2 has an FNO of3.5.

TABLE 3 Optical Portion of Total Track Object-Side Surface Object-SideSurface Lens Length (I) AR α A ZS AR′ α′ A′ ZS′ L1 16.9 0.613 104.37523.750 1.405 0.813 71.253 13.414 0.794 L2 15.65 0.613 104.375 23.7501.518 0.861 61.153 12.399 0.792 L3 13.5 0.613 104.375 23.750 1.759 0.79275.257 13.882 1.028 L4 11.994 0.613 104.375 23.750 1.980 0.877 57.31912.068 1.006 L5 10.588 0.613 104.375 23.750 2.243 0.907 49.750 11.4931.085 L6 6.788 0.613 104.375 23.750 3.499 0.853 62.877 12.557 1.850 L75.562 0.613 104.375 23.750 4.270 0.798 74.136 13.747 2.472

In a fourth embodiment of a lens assembly 2, a first lens L1 to a thirdlens L3 among a plurality of lenses are non-circular, the other lensesare circular, and a length of a relative long side of the image sensor Sis 1.5 times or more a length of a relative short side of the imagesensor S. For example, a ratio of the length of the relative long sideto the relative short side of the image sensor S is 16:9, 18:9, or 19:9.

The plurality of lenses include a first lens L1 to a fifth lens L5, andthe lens assembly 2, in the fourth embodiment of the lens assembly 2,has a fixed focal length.

Further, the lens assembly 2 has an FNO of 4.0. FNO refers to a constantindicating brightness of a lens assembly 2.

Referring to FIG. 8, an image sensor S has a rectangular shape, and alength of a relative long side of the image sensor S, in the fourth tosixth embodiments of the lens assembly 2, is 1.5 times or more a lengthof a relative short side of the lens assembly 2.

The image sensor S includes an effective imaging area EA, and the numberof pixels of the effective imaging area EA in a traverse direction(corresponding to the relative long side of the image sensor S) is 1.5times or more the number of pixels in a longitudinal direction(corresponding to the relative short side of the image sensor S). Forexample, a ratio of the number of pixels of the effective imaging areaEA in a traverse direction to the number of pixels of the effectiveimaging area EA in a longitudinal direction is 16:9, 18:9, or 19:9.

The image sensor S may be connected to a substrate by a wire bondingprocess. For this purpose, a bonding pad B may be provided in the imagesensor S.

The bonding pad B may be formed at a position adjacent to both sides ofthe relative short side of the image sensor S.

The first lens L1 satisfies the following Conditional Expression 4-1,the second lens L2 satisfies the following Conditional Expression 4-2,and the third lens L3 satisfies the following Conditional Expression4-3.

1.1 mm<ZS1<1.438 mm   [Conditional Expression 4-1]

1.258 mm<ZS2<1.644 mm   [Conditional Expression 4-2]

1.522 mm<ZS3<1.989 mm   [Conditional Expression 4-3]

In Conditional Expression 4-1, ZS1 refers to a ratio (A1/l1) of an area(A1) of an object-side surface of the first lens L1 to a distance (l1)of the optical axis from the object-side surface of the first lens L1 toan imaging plane of an image sensor S. The area (A1) of the object-sidesurface of the first lens L1 refers to the total area of the object-sidesurface of the first lens L1 (the sum of an area of an optical portionand an area of a flange portion).

In Conditional Expression 4-2, ZS2 refers to a ratio (A2/l2) of an area(A2) of an object-side surface of the second lens L2 to a distance (l2)of the optical axis from the object-side surface of the second lens L2to an imaging plane of an image sensor S. The area (A2) of theobject-side surface of the second lens L2 refers to the total area ofthe object-side surface of the second lens L2 (the sum of an area of anoptical portion and an area of a flange portion).

In Conditional Expression 4-3, ZS3 refers to a ratio (A3/l3) of an area(A3) of an object-side surface of the third lens L3 to a distance (l3)of the optical axis from the object-side surface of the third lens L3 toan imaging plane of an image sensor S. The area (A3) of the object-sidesurface of the third lens L3 refers to the total area of the object-sidesurface of the third lens L3 (the sum of an area of an optical portionand an area of a flange portion).

In the fourth embodiment, the first lens L1 to the third lens L3 satisfyat least one of the following Conditional Expressions 4-4 and 4-5.

86.2 degrees<α<116.0 degrees   [Conditional Expression 4-4]

0.53<AR<0.73   [Conditional Expression 4-5]

In Conditional Expression 4-4, α refers to an angle between the firstimaginary line (P1) and the second imaginary line (P2) of the first lensL1.

In Conditional Expression 4-5, AR refers to an aspect ratio of theobject-side surface of the first lens L1. AR refers to a ratio of alength of the minor axis (b) of the first lens L1 to a length of themajor axis (a) of the first lens L1.

An angle between the first imaginary line and the second imaginary lineof the second lens L2 and the third lens L3, and an aspect ratio of theobject-side surface of the second lens L2 and the third lens L3 refer tothe same characteristics as previously described with regard to thefirst lens L1.

The first lens L1 satisfies at least one of the following ConditionalExpressions 4-6 to 4-8.

0.855 mm<ZS′1<1.089 mm   [Conditional Expression 4-6]

79.1 degrees<α′1<110.3 degrees   [Conditional Expression 4-7]

0.571<AR′1<0.771   [Conditional Expression 4-8]

In Conditional Expression 4-6, ZS′1 refers to a ratio (A′1/l1) of anarea (A′1) of an object-side surface of the first lens L1 to a distance(l1) of the optical axis from the object-side surface of the first lensL1 to an imaging plane of an image sensor S. The area (A′1) of theobject-side surface of the first lens L1 refers to an area of theoptical portion 10 in the object-side surface of the first lens L1.

In Conditional Expression 4-7, α′1 refers to an angle between a firstimaginary line (P1′) connecting an optical axis and a connection pointbetween a first edge 11 and a fourth edge 14 of the optical portion 10of the first lens L1 and a second imaginary line (P2′) connecting anoptical axis and a connection point between a second edge 12 and afourth edge 14 of the optical portion 10 of the first lens L1.

In Conditional Expression 4-8, AR′1 refers to an aspect ratio of theoptical portion 10 in the object-side surface of the first lens L1. AR′1refers to a ratio of a length of the minor axis (d) of the opticalportion 10 of the first lens L1 to a length of the major axis (c) of theoptical portion 10 of the first lens L1.

The second lens L2 satisfies at least one of the following ConditionalExpressions 4-9 to 4-11.

0.866 mm<ZS′2<1.052 mm  [Conditional Expression 4-9]

62.4 degrees<α′2<98.1 degrees   [Conditional Expression 4-10]

0.655<AR′2<0.855   [Conditional Expression 4-11]

In Conditional Expression 4-9, ZS′2 refers to a ratio (A′2/l2) of anarea (A′2) of an object-side surface of the second lens L2 to a distance(l2) of the optical axis from the object-side surface of the second lensL2 to an imaging plane of an image sensor S. The area (A′2) of theobject-side surface of the second lens L2 refers to an area of theoptical portion in the object-side surface of the second lens L2.

In Conditional Expression 4-10, α′2 refers to an angle between a firstimaginary line connecting an optical axis and a connection point betweena first edge and a fourth edge of the optical portion of the second lensL2 and a second imaginary line connecting an optical axis and aconnection point between a second edge and a fourth edge of the opticalportion of the second lens L2.

In Conditional Expression 4-11, AR′2 refers to an aspect ratio of theoptical portion in the object-side surface of the second lens L2. AR′2refers to a ratio of a length of the minor axis of the optical portionof the second lens L2 to a length of the major axis of the opticalportion of the second lens L2.

The third lens L3 satisfies at least one of the following ConditionalExpressions 4-12 to 4-14.

0.764 mm<ZS′3<0.801 mm   [Conditional Expression 4-12]

0 degree<α′3<55.5 degrees   [Conditional Expression 4-13]

0.885<AR′3<1.000   [Conditional Expression 4-14]

In Conditional Expression 4-12, ZS′3 refers to a ratio (A′3/l3) of anarea (A′3) of an object-side surface of the third lens L3 to a distance(l3) of the optical axis from the object-side surface of the third lensL3 to an imaging plane of an image sensor S. The area (A′3) of theobject-side surface of the third lens L3 refers to an area of an opticalportion in the object-side surface of the third lens L3.

In Conditional Expression 4-13, α′3 refers to an angle between a firstimaginary line connecting an optical axis and a connection point betweena first edge and a fourth edge of the optical portion of the third lensL3 and a second imaginary line connecting an optical axis and aconnection point between a second edge and a fourth edge of the opticalportion of the third lens L3.

In Conditional Expression 4-14, AR′3 refers to an aspect ratio of theoptical portion in the object-side surface of the third lens L3. AR′3refers to a ratio of a length of the minor axis of the optical portionof the third lens L3 to a length of the major axis of the opticalportion of the third lens L3.

The following Table 4 illustrates embodiments of the lens assembly 2satisfying the above Conditional Expressions 4-1 to 4-14.

TABLE 4 Optical Portion of Total Track Object-Side Surface Object-SideSurface Lens Length (I) AR α A ZS AR′ α′ A′ ZS′ L1 24.207 0.630 101.88630.934 1.278 0.671 95.696 23.693 0.979 L2 21.169 0.630 101.886 30.9341.461 0.755 81.867 20.487 0.968 L3 17.501 0.630 101.886 30.934 1.7680.985 19.938 13.981 0.799

The first lens L1 and the second lens L2 are configured to be alignedwith respect to each other. For example, the first lens L1 and thesecond lens L2 are coupled to each other to align their optical axes.

A flange portion of an image-side surface of the first lens L1 and aflange portion of an object-side surface of the second lens L2 have aconcavo-convex structure, respectively, and the concavo-convex structureof the first lens L1 and the concavo-convex structure of the second lensL2 are configured to be coupled to each other such that the optical axisis aligned.

Further, the second lens L2 and the third lens L3 are configured to bealigned with respect to each other. For example, the second lens L2 andthe third lens L3 are coupled to each other to align their optical axes.

A flange portion of an image-side surface of the second lens L2 and aflange portion of an object-side surface of the third lens L3 have aconcavo-convex structure, respectively, and the concavo-convex structureof the second lens L2 and the concavo-convex structure of the third lensL3 are configured to be coupled to each other such that the optical axisis aligned.

As a fifth embodiment of a lens assembly 2, a case in which all of aplurality of lenses are non-circular, and a length of a relative longside of the image sensor S is 1.5 times or more a length of a relativeshort side of the image sensor S will be described. For example, a ratioof the length of the relative long side to the relative short side ofthe image sensor S is 16:9, 18:9, or 19:9. The plurality of lensesinclude a first lens L1 to a fifth lens L5, and the lens assembly 2, inthe fifth embodiment of the lens assembly 2, has a fixed focal length.

Further, the lens assembly 2 has an FNO of 4.0. FNO refers to a constantindicating brightness of a lens assembly 2.

The first lens L1 satisfies the following Conditional Expression 5-1,the second lens L2 satisfies the following Conditional Expression 5-2,the third lens L3 satisfies the following Conditional Expression 5-3,the fourth lens L4 satisfies the following Conditional Expression 5-4,and the fifth lens L5 satisfies the following Conditional Expression5-5.

0.916 mm<ZS1<1.284 mm   [Conditional Expression 5-1]

1.048 mm<ZS2<1.468 mm   [Conditional Expression 5-2]

1.267 mm<ZS3<1.776 mm   [Conditional Expression 5-3]

1.352 mm<ZS4<1.895 mm   [Conditional Expression 5-4]

1.572 mm<ZS5<2.203 mm   [Conditional Expression 5-5]

In Conditional Expression 5-1, ZS1 refers to a ratio (A1/l1) of an area(A1) of an object-side surface of the first lens L1 to a distance (l1)of the optical axis from the object-side surface of the first lens L1 toan imaging plane of an image sensor S. The area (A1) of the object-sidesurface of the first lens L1 refers to the total area of the object-sidesurface of the first lens L1 (the sum of an area of an optical portionand an area of a flange portion).

In Conditional Expression 5-2, ZS2 refers to a ratio (A2/l2) of an area(A2) of an object-side surface of the second lens L2 to a distance (l2)of the optical axis from the object-side surface of the second lens L2to an imaging plane of an image sensor S. The area (A2) of theobject-side surface of the second lens L2 refers to the total area ofthe object-side surface of the second lens L2 (the sum of an area of anoptical portion and an area of a flange portion).

In Conditional Expression 5-3, ZS3 refers to a ratio (A3/l3) of an area(A3) of an object-side surface of the third lens L3 to a distance (l3)of the optical axis from the object-side surface of the third lens L3 toan imaging plane of an image sensor S. The area (A3) of the object-sidesurface of the third lens L3 refers to the total area of the object-sidesurface of the third lens L3 (the sum of an area of an optical portionand an area of a flange portion).

In Conditional Expression 5-4, ZS4 refers to a ratio (A4/l4) of an area(A4) of an object-side surface of the fourth lens L4 to a distance (l4)of the optical axis from the object-side surface of the fourth lens L4to an imaging plane of an image sensor S. The area (A4) of theobject-side surface of the fourth lens L4 refers to the total area ofthe object-side surface of the fourth lens L4 (the sum of an area of anoptical portion and an area of a flange portion).

In Conditional Expression 5-5, ZS5 refers to a ratio (A5/l5) of an area(A5) of an object-side surface of the fifth lens L5 to a distance (l5)of the optical axis from the object-side surface of the fifth lens L5 toan imaging plane of an image sensor S. The area (A5) of the object-sidesurface of the fifth lens L5 refers to the total area of the object-sidesurface of the fifth lens L5 (the sum of an area of an optical portionand an area of a flange portion).

In the fifth embodiment, the first lens L1 to the fifth lens L5 satisfyat least one of the following Conditional Expressions 5-6 and 5-7.

101.3 degrees<α<128.6 degrees   [Conditional Expression 5-6]

0.434<AR<0.634   [Conditional Expression 5-7]

In Conditional Expression 5-6, α refers to an angle between the firstimaginary line (P1) and the second imaginary line (P2) of the first lensL1.

In Conditional Expression 5-7, AR refers to an aspect ratio of theobject-side surface of the first lens L1. AR refers to a ratio of alength of the minor axis (b) of the first lens L1 to a length of themajor axis (a) of the first lens L1.

An angle between the first imaginary line and the second imaginary lineof the second lens L2 to the fifth lens L5, and an aspect ratio of theobject-side surface of the second lens L2 to the fifth lens L5 refer tothe same characteristics as previously described with regard to thefirst lens L1.

The first lens L1 satisfies at least one of the following ConditionalExpressions 5-8 to 5-10.

0.701 mm<ZS′1<0.963 mm   [Conditional Expression 5-8]

97.7 degrees<α′1<125.5 degrees   [Conditional Expression 5-9]

0.458<AR′1<0.658   [Conditional Expression 5-10]

In Conditional Expression 5-8, ZS′1 refers to a ratio (A1/l1) of an area(A′1) of an object-side surface of the first lens L1 to a distance (l1)of the optical axis from the object-side surface of the first lens L1 toan imaging plane of an image sensor S. The area (A′1) of the object-sidesurface of the first lens L1 refers to an area of the optical portion 10in the object-side surface of the first lens L1.

In Conditional Expression 5-9, α′1 refers to an angle between a firstimaginary line (P1′) connecting an optical axis and a connection pointbetween a first edge 11 and a fourth edge 14 of the optical portion 10of the first lens L1 and a second imaginary line (P2′) connecting anoptical axis and a connection point between a second edge 12 and afourth edge 14 of the optical portion 10 of the first lens L1.

In Conditional Expression 5-10, AR′1 refers to an aspect ratio of theoptical portion 10 in the object-side surface of the first lens L1. AR′1refers to a ratio of a length of the minor axis (d) of the opticalportion 10 of the first lens L1 to a length of the major axis (c) of theoptical portion 10 of the first lens L1.

The second lens L2 satisfies at least one of the following ConditionalExpressions 5-11 to 5-13.

0.720 mm<ZS′2<0.942 mm   [Conditional Expression 5-11]

86.5 degrees<α′2<116.2 degrees   [Conditional Expression 5-12]

0.528<AR′2<0.728   [Conditional Expression 5-13]

In Conditional Expression 5-11, ZS′2 refers to a ratio (A′2/l2) of anarea (A′2) of an object-side surface of the second lens L2 to a distance(l2) of the optical axis from the object-side surface of the second lensL2 to an imaging plane of an image sensor S. The area (A′2) of theobject-side surface of the second lens L2 refers to an area of theoptical portion in the object-side surface of the second lens L2.

In Conditional Expression 5-12, α′2 refers to an angle between a firstimaginary line connecting an optical axis and a connection point betweena first edge and a fourth edge of the optical portion of the second lensL2 and a second imaginary line connecting an optical axis and aconnection point between a second edge and a fourth edge of the opticalportion of the second lens L2.

In Conditional Expression 5-13, AR′2 refers to an aspect ratio of theoptical portion in the object-side surface of the second lens L2. AR′2refers to a ratio of a length of the minor axis of the optical portionof the second lens L2 to a length of the major axis of the opticalportion of the second lens L2.

The third lens L3 satisfies at least one of the following ConditionalExpressions 5-14 to 5-16.

0.664 mm<ZS′3<0.779 mm   [Conditional Expression 5-14]

46.4 degrees<α′3<88.0 degrees   [Conditional Expression 5-15]

0.719<AR′3<0.919   [Conditional Expression 5-16]

In Conditional Expression 5-14, ZS′3 refers to a ratio (A′3/l3) of anarea (A′3) of an object-side surface of the third lens L3 to a distance(l3) of the optical axis from the object-side surface of the third lensL3 to an imaging plane of an image sensor S. The area (A′3) of theobject-side surface of the third lens L3 refers to an area of an opticalportion in the object-side surface of the third lens L3.

In Conditional Expression 5-15, α′3 refers to an angle between a firstimaginary line connecting an optical axis and a connection point betweena first edge and a fourth edge of the optical portion of the third lensL3 and a second imaginary line connecting an optical axis and aconnection point between a second edge and a fourth edge of the opticalportion of the third lens L3.

In Conditional Expression 5-16, AR′3 refers to an aspect ratio of theoptical portion in the object-side surface of the third lens L3. AR′3refers to a ratio of a length of the minor axis of the optical portionof the third lens L3 to a length of the major axis of the opticalportion of the third lens L3.

The fourth lens L4 satisfies at least one of the following ConditionalExpressions 5-17 to 5-19.

0.685 mm<ZS′4<0.792 mm   [Conditional Expression 5-17]

38.5 degrees<α′4<83.8 degrees   [Conditional Expression 5-18]

0.744<AR′4<0.944   [Conditional Expression 5-19]

In Conditional Expression 5-17, ZS′4 refers to a ratio (A′4/l4) of anarea (A′4) of an object-side surface of the fourth lens L4 to a distance(l4) of the optical axis from the object-side surface of the fourth lensL4 to an imaging plane of an image sensor S. The area (A′4) of theobject-side surface of the fourth lens L4 refers to an area of anoptical portion in the object-side surface of the fourth lens L4.

In Conditional Expression 5-18, α′4 refers to an angle between a firstimaginary line connecting an optical axis and a connection point betweena first edge and a fourth edge of the optical portion of the fourth lensL4 and a second imaginary line connecting an optical axis and aconnection point between a second edge and a fourth edge of the opticalportion of the fourth lens L4.

In Conditional Expression 5-19, AR′4 refers to an aspect ratio of theoptical portion in the object-side surface of the fourth lens L4. AR′4refers to a ratio of a length of the minor axis of the optical portionof the fourth lens L4 to a length of the major axis of the opticalportion of the fourth lens L4.

The fifth lens L5 satisfies at least one of the following ConditionalExpressions 5-20 to 5-22.

0.790 mm<ZS′5<0.911 mm   [Conditional Expression 5-20]

36.5 degrees<α′5<82.9 degrees   [Conditional Expression 5-21]

0.750<AR′5<0.950   [Conditional Expression 5-22]

In Conditional Expression 5-20, ZS′5 refers to a ratio (A′5/l5) of anarea (A′5) of an object-side surface of the fifth lens L5 to a distance(l5) of the optical axis from the object-side surface of the fifth lensL5 to an imaging plane of an image sensor S. The area (A′5) of theobject-side surface of the fifth lens L5 refers to an area of an opticalportion in the object-side surface of the fifth lens L5.

In Conditional Expression 5-21, α′5 refers to an angle between a firstimaginary line connecting an optical axis and a connection point betweena first edge and a fourth edge of the optical portion of the fifth lensL5 and a second imaginary line connecting an optical axis and aconnection point between a second edge and a fourth edge of the opticalportion of the fifth lens L5.

In Conditional Expression 5-22, AR′5 refers to an aspect ratio of theoptical portion in the object-side surface of the fifth lens L5. AR′5refers to a ratio of a length of the minor axis of the optical portionof the fifth lens L5 to a length of the major axis of the opticalportion of the fifth lens L5.

The following Table 5 illustrates an embodiment of the lens assembly 2satisfying the above Conditional Expressions 5-1 to 5-22.

TABLE 5 Optical Portion of Total Track Object-Side Surface Object-SideSurface Lens Length (I) AR α A ZS AR′ α′ A′ ZS′ L1 24.207 0.534 115.47626.800 1.107 0.558 112.141 20.275 0.838 L2 21.169 0.534 115.476 26.8001.266 0.628 102.144 17.711 0.837 L3 17.501 0.534 115.476 26.800 1.5310.819 69.996 12.754 0.729 L4 16.402 0.534 115.476 26.800 1.634 0.84464.862 12.246 0.747 L5 14.107 0.534 115.476 26.800 1.900 0.850 63.65012.134 0.860

The first lens L1 and the second lens L2 are configured to be alignedwith respect to each other. For example, the first lens L1 and thesecond lens L2 are coupled to each other to align their optical axes.

A flange portion of an image-side surface of the first lens L1 and aflange portion of an object-side surface of the second lens L2 have aconcavo-convex structure, respectively, and the concavo-convex structureof the first lens L1 and the concavo-convex structure of the second lensL2 are configured to be coupled to each other such that the optical axisis aligned.

As a sixth embodiment of a lens assembly 2, a case in which all of aplurality of lenses are non-circular, and a length of a relative longside of the image sensor S is 1.5 times or more a length of a relativeshort side of the image sensor S will be described. For example, a ratioof the length of the relative long side to the relative short side ofthe image sensor S is 16:9, 18:9, or 19:9. The plurality of lensesinclude a first lens L1 to a seventh lens L7, and the lens assembly 2,in the sixth embodiment of the lens assembly 2, has a variable focallength. In this case, the lens assembly 2 of the sixth embodiment maychange a focal length of the lens assembly 2 by moving at least aportion of the lenses to change a distance between the lenses.

Further, the lens assembly 2 has an FNO of 4.0. FNO refers to a constantindicating brightness of a lens assembly 2.

The first lens L1 satisfies the following Conditional Expression 6-1,the second lens L2 satisfies the following Conditional Expression 6-2,the third lens L3 satisfies the following Conditional Expression 6-3,the fourth lens L4 satisfies the following Conditional Expression 6-4,the fifth lens L5 satisfies the following Conditional Expression 6-5,the sixth lens L6 satisfies the following Conditional Expression 6-6,and the seventh lens L7 satisfies the following Conditional Expression6-7.

0.920 mm<ZS1<1.355 mm   [Conditional Expression 6-1]

0.994 mm<ZS2<1.464 mm   [Conditional Expression 6-2]

1.152 mm<ZS3<1.697 mm   [Conditional Expression 6-3]

1.296 mm<ZS4<1.910 mm   [Conditional Expression 6-4]

1.469 mm<ZS5<2.163 mm   [Conditional Expression 6-5]

2.291 mm<ZS6<3.374 mm   [Conditional Expression 6-6]

2.796 mm<ZS7<4.118 mm   [Conditional Expression 6-7]

In Conditional Expression 6-1, ZS1 refers to a ratio (A1/l1) of an area(A1) of an object-side surface of the first lens L1 to a distance (l1)of the optical axis from the object-side surface of the first lens L1 toan imaging plane of an image sensor S. The area (A1) of the object-sidesurface of the first lens L1 refers to the total area of the object-sidesurface of the first lens L1 (the sum of an area of an optical portionand an area of a flange portion).

In Conditional Expression 6-2, ZS2 refers to a ratio (A2/l2) of an area(A2) of an object-side surface of the second lens L2 to a distance (l2)of the optical axis from the object-side surface of the second lens L2to an imaging plane of an image sensor S. The area (A2) of theobject-side surface of the second lens L2 refers to the total area ofthe object-side surface of the second lens L2 (the sum of an area of anoptical portion and an area of a flange portion).

In Conditional Expression 6-3, ZS3 refers to a ratio (A3/l3) of an area(A3) of an object-side surface of the third lens L3 to a distance (l3)of the optical axis from the object-side surface of the third lens L3 toan imaging plane of an image sensor S. The area (A3) of the object-sidesurface of the third lens L3 refers to the total area of the object-sidesurface of the third lens L3 (the sum of an area of an optical portionand an area of a flange portion).

In Conditional Expression 6-4, ZS4 refers to a ratio (A4/l4) of an area(A4) of an object-side surface of the fourth lens L4 to a distance (l4)of the optical axis from the object-side surface of the fourth lens L4to an imaging plane of an image sensor S. The area (A4) of theobject-side surface of the fourth lens L4 refers to the total area ofthe object-side surface of the fourth lens L4 (the sum of an area of anoptical portion and an area of a flange portion).

In Conditional Expression 6-5, ZS5 refers to a ratio (A5/l5) of an area(A5) of an object-side surface of the fifth lens L5 to a distance (l5)of the optical axis from the object-side surface of the fifth lens L5 toan imaging plane of an image sensor S. The area (A5) of the object-sidesurface of the fifth lens L5 refers to the total area of the object-sidesurface of the fifth lens L5 (the sum of an area of an optical portionand an area of a flange portion).

In Conditional Expression 6-6, ZS6 refers to a ratio (A6/l6) of an area(A6) of an object-side surface of the sixth lens L6 to a distance (l6)of the optical axis from the object-side surface of the sixth lens L6 toan imaging plane of an image sensor S. The area (A6) of the object-sidesurface of the sixth lens L6 refers to the total area of the object-sidesurface of the sixth lens L6 (the sum of an area of an optical portionand an area of a flange portion).

In Conditional Expression 6-7, ZS7 refers to a ratio (A7/l7) of an area(A7) of an object-side surface of the seventh lens L7 to a distance (l7)of the optical axis from the object-side surface of the seventh lens L7to an imaging plane of an image sensor S. The area (A7) of theobject-side surface of the seventh lens L7 refers to the total area ofthe object-side surface of the seventh lens L7 (the sum of an area of anoptical portion and an area of a flange portion).

In the sixth embodiment, the first lens L1 to the seventh lens L7satisfies at least one of the following Conditional Expressions 6-8 and6-9.

109.2 degrees<α<135.4 degrees   [Conditional Expression 6-8]

0.379<AR<0.579   [Conditional Expression 6-9]

In Conditional Expression 6-8, α refers to an angle between the firstimaginary line (P1) and the second imaginary line (P2) of the first lensL1.

In Conditional Expression 6-9, AR refers to an aspect ratio of theobject-side surface of the first lens L1. AR refers to a ratio of alength of the minor axis (b) of the first lens L1 to a length of themajor axis (a) of the first lens L1.

An angle between the first imaginary line and the second imaginary lineof the second lens L2 to the seventh lens L7, and an aspect ratio of theobject-side surface of the second lens L2 to the seventh lens L7 referto the same characteristics as previously described with regard to thefirst lens L1.

The first lens L1 satisfies at least one of the following ConditionalExpressions 6-10 to 6-12.

0.630 mm<ZS′1<0.855 mm   [Conditional Expression 6-10]

95.1 degrees<α′1<123.3 degrees   [Conditional Expression 6-11]

0.475<AR′1<0.675   [Conditional Expression 6-11]

In Conditional Expression 6-10, ZS′1 refers to a ratio (A1/l1) of anarea (A′1) of an object-side surface of the first lens L1 to a distance(l1) of the optical axis from the object-side surface of the first lensL1 to an imaging plane of an image sensor S. The area (A′1) of theobject-side surface of the first lens L1 refers to an area of theoptical portion 10 in the object-side surface of the first lens L1.

In Conditional Expression 6-11, α′1 refers to an angle between a firstimaginary line (P1′) connecting an optical axis and a connection pointbetween a first edge 11 and a fourth edge 14 of the optical portion 10of the first lens L1 and a second imaginary line (P2′) connecting anoptical axis and a connection point between a second edge 12 and afourth edge 14 of the optical portion 10 of the first lens L1.

In Conditional Expression 6-12, AR′1 refers to an aspect ratio of theoptical portion 10 in the object-side surface of the first lens L1. AR′1refers to a ratio of a length of the minor axis (d) of the opticalportion 10 of the first lens L1 to a length of the major axis (c) of theoptical portion 10 of the first lens L1.

The second lens L2 satisfies at least one of the following ConditionalExpressions 6-13 to 6-15.

0.646 mm<ZS′2<0.856 mm   [Conditional Expression 6-13]

89.7 degrees<α′2<118.8 degrees   [Conditional Expression 6-14]

0.509<AR′2<0.709   [Conditional Expression 6-15]

In Conditional Expression 6-13, ZS′2 refers to a ratio (A′2/l2) of anarea (A′2) of an object-side surface of the second lens L2 to a distance(l2) of the optical axis from the object-side surface of the second lensL2 to an imaging plane of an image sensor S. The area (A′2) of theobject-side surface of the second lens L2 refers to an area of theoptical portion in the object-side surface of the second lens L2.

In Conditional Expression 6-14, α′2 refers to an angle between a firstimaginary line connecting an optical axis and a connection point betweena first edge and a fourth edge of the optical portion of the second lensL2 and a second imaginary line connecting an optical axis and aconnection point between a second edge and a fourth edge of the opticalportion of the second lens L2.

In Conditional Expression 6-15, AR′2 refers to an aspect ratio of theoptical portion in the object-side surface of the second lens L2. AR′2refers to a ratio of a length of the minor axis of the optical portionof the second lens L2 to a length of the major axis of the opticalportion of the second lens L2.

The third lens L3 satisfies at least one of the following ConditionalExpressions 6-16 to 6-18.

0.807 mm<ZS′3<1.108 mm   [Conditional Expression 6-16]

97.4 degrees<α′3<125.2 degrees   [Conditional Expression 6-17]

0.460<AR′3<0.660   [Conditional Expression 6-18]

In Conditional Expression 6-16, ZS′3 refers to a ratio (A′3/l3) of anarea (A′3) of an object-side surface of the third lens L3 to a distance(l3) of the optical axis from the object-side surface of the third lensL3 to an imaging plane of an image sensor S. The area (A′3) of theobject-side surface of the third lens L3 refers to an area of an opticalportion in the object-side surface of the third lens L3.

In Conditional Expression 6-17, α′3 refers to an angle between a firstimaginary line connecting an optical axis and a connection point betweena first edge and a fourth edge of the optical portion of the third lensL3 and a second imaginary line connecting an optical axis and aconnection point between a second edge and a fourth edge of the opticalportion of the third lens L3.

In Conditional Expression 6-18, AR′3 refers to an aspect ratio of theoptical portion in the object-side surface of the third lens L3. AR′3refers to a ratio of a length of the minor axis of the optical portionof the third lens L3 to a length of the major axis of the opticalportion of the third lens L3.

The fourth lens L4 satisfies at least one of the following ConditionalExpressions 6-19 to 6-21.

0.828 mm<ZS′4<1.089 mm   [Conditional Expression 6-19]

87.8 degrees<α′4<117.3 degrees   [Conditional Expression 6-20]

0.521<AR′4<0.721   [Conditional Expression 6-21]

In Conditional Expression 6-19, ZS′4 refers to a ratio (A′4/l4) of anarea (A′4) of an object-side surface of the fourth lens L4 to a distance(l4) of the optical axis from the object-side surface of the fourth lensL4 to an imaging plane of an image sensor S. The area (A′4) of theobject-side surface of the fourth lens L4 refers to an area of anoptical portion in the object-side surface of the fourth lens L4.

In Conditional Expression 6-20, α′4 refers to an angle between a firstimaginary line connecting an optical axis and a connection point betweena first edge and a fourth edge of the optical portion of the fourth lensL4 and a second imaginary line connecting an optical axis and aconnection point between a second edge and a fourth edge of the opticalportion of the fourth lens L4.

In Conditional Expression 6-21, AR′4 refers to an aspect ratio of theoptical portion in the object-side surface of the fourth lens L4. AR′4refers to a ratio of a length of the minor axis of the optical portionof the fourth lens L4 to a length of the major axis of the opticalportion of the fourth lens L4.

The fifth lens L5 satisfies at least one of the following ConditionalExpressions 6-22 to 6-24.

0.909 mm<ZS′5<1.179 mm   [Conditional Expression 6-22]

84.3 degrees<α′5<114.4 degrees   [Conditional Expression 6-23]

0.542<AR′5<0.742   [Conditional Expression 6-24]

In Conditional Expression 6-22, ZS′S refers to a ratio (A′5/l5) of anarea (A′5) of an object-side surface of the fifth lens L5 to a distance(l5) of the optical axis from the object-side surface of the fifth lensL5 to an imaging plane of an image sensor S. The area (A′5) of theobject-side surface of the fifth lens L5 refers to an area of an opticalportion in the object-side surface of the fifth lens L5.

In Conditional Expression 6-23, α′5 refers to an angle between a firstimaginary line connecting an optical axis and a connection point betweena first edge and a fourth edge of the optical portion of the fifth lensL5 and a second imaginary line connecting an optical axis and aconnection point between a second edge and a fourth edge of the opticalportion of the fifth lens L5.

In Conditional Expression 6-24, AR′5 refers to an aspect ratio of theoptical portion in the object-side surface of the fifth lens L5. AR′5refers to a ratio of a length of the minor axis of the optical portionof the fifth lens L5 to a length of the major axis of the opticalportion of the fifth lens L5.

The sixth lens L6 satisfies at least one of the following ConditionalExpressions 6-25 to 6-27.

1.502 mm<ZS′6<1.997 mm   [Conditional Expression 6-25]

90.6 degrees<α′6<119.5 degrees   [Conditional Expression 6-26]

0.503<AR′6<0.703   [Conditional Expression 6-27]

In Conditional Expression 6-25, ZS′6 refers to a ratio (A′6/l6) of anarea (A′6) of an object-side surface of the sixth lens L6 to a distance(l6) of the optical axis from the object-side surface of the sixth lensL6 to an imaging plane of an image sensor S. The area (A′6) of theobject-side surface of the sixth lens L6 refers to an area of an opticalportion in the object-side surface of the sixth lens L6.

In Conditional Expression 6-26, α′6 refers to an angle between a firstimaginary line connecting an optical axis and a connection point betweena first edge and a fourth edge of the optical portion of the sixth lensL6 and a second imaginary line connecting an optical axis and aconnection point between a second edge and a fourth edge of the opticalportion of the sixth lens L6.

In Conditional Expression 6-27, AR′6 refers to an aspect ratio of theoptical portion in the object-side surface of the sixth lens L6. AR′6refers to a ratio of a length of the minor axis of the optical portionof the sixth lens L6 to a length of the major axis of the opticalportion of the sixth lens L6.

The seventh lens L7 satisfies at least one of the following ConditionalExpressions 6-28 to 6-30.

1.946 mm<ZS′7<2.662 mm   [Conditional Expression 6-28]

96.7 degrees<α′7<124.7 degrees   [Conditional Expression 6-29]

0.464<AR′7<0.664   [Conditional Expression 6-30]

In Conditional Expression 6-28, ZS′7 refers to a ratio (A′7/l7) of anarea (A′7) of an object-side surface of the seventh lens L7 to adistance (l7) of the optical axis from the object-side surface of theseventh lens L7 to an imaging plane of an image sensor S. The area (A′7)of the object-side surface of the seventh lens L7 refers to an area ofan optical portion in the object-side surface of the seventh lens L7.

In Conditional Expression 6-29, α′7 refers to an angle between a firstimaginary line connecting an optical axis and a connection point betweena first edge and a fourth edge of the optical portion of the seventhlens L7 and a second imaginary line connecting an optical axis and aconnection point between a second edge and a fourth edge of the opticalportion of the seventh lens L7.

In Conditional Expression 6-30, AR′7 refers to an aspect ratio of theoptical portion in the object-side surface of the seventh lens L7. AR′7refers to a ratio of a length of the minor axis of the optical portionof the seventh lens L7 to a length of the major axis of the opticalportion of the seventh lens L7.

The following Table 6 illustrates an embodiment of the lens assembly 2satisfying the above Conditional Expressions 6-1 to 6-30.

TABLE 6 Optical Portion of Total Track Object-Side Surface Object-SideSurface Lens Length (I) AR α A ZS AR′ α′ A′ ZS′ L1 27.310 0.479 122.71631.257 1.145 0.575 109.820 20.415 0.748 L2 25.290 0.479 122.716 31.2571.236 0.609 104.981 19.118 0.756 L3 21.815 0.479 122.716 31.257 1.4330.560 111.872 21.022 0.964 L4 19.382 0.479 122.716 31.257 1.613 0.621103.282 18.703 0.965 L5 17.110 0.479 122.716 31.257 1.827 0.642 100.17417.991 1.051 L6 10.969 0.479 122.716 31.257 2.850 0.603 105.771 19.3181.761 L7 8.988 0.479 122.716 31.257 3.478 0.564 111.290 20.846 2.319

The first to sixth embodiments of the lens assembly 2 described abovesatisfy at least one of the following Conditional Expressions 7 and 8.

0.62398<ZS1/ZS2<1.36318   [Conditional Expression 7]

0.73598<ZS′1/ZS′2<1.37987   [Conditional Expression 8]

In Conditional Expression 7, ZS1 refers to a ratio (A1/l1) of an area(A1) of an object-side surface of the first lens L1 to a distance (l1)of the optical axis from the object-side surface of the first lens L1 toan imaging plane of an image sensor S. The area (A1) of the object-sidesurface of the first lens L1 refers to the total area of the object-sidesurface of the first lens L1 (the sum of an area of an optical portionand an area of a flange portion).

Further, ZS2 refers to a ratio (A2/l2) of an area (A2) of an object-sidesurface of the second lens L2 to a distance (l2) of the optical axisfrom the object-side surface of the second lens L2 to an imaging planeof an image sensor S. The area (A2) of the object-side surface of thesecond lens L2 refers to the total area of the object-side surface ofthe second lens L2 (the sum of an area of an optical portion and an areaof a flange portion).

In Conditional Expression 8, ZS′1 refers to a ratio (A1/l1) of an area(A′1) of an object-side surface of the first lens L1 to a distance (l1)of the optical axis from the object-side surface of the first lens L1 toan imaging plane of an image sensor S. The area (A′1) of the object-sidesurface of the first lens L1 refers to an area of the optical portion 10in the object-side surface of the first lens L1.

Further, ZS′2 refers to a ratio (A′2/l2) of an area (A′2) of anobject-side surface of the second lens L2 to a distance (l2) of theoptical axis from the object-side surface of the second lens L2 to animaging plane of an image sensor S. The area (A′2) of the object-sidesurface of the second lens L2 refers to an area of the optical portionin the object-side surface of the second lens L2.

Next, an optical imaging system 3 including a first lens to a fifth lenswill be described with reference to FIGS. 9 to 23.

In the configuration diagrams of FIGS. 9 to 23, a thickness, a size, anda shape of a lens may be exaggerated for the sake of explanation. Forexample, a shape of a spherical or non-spherical surface of the lensillustrated in the configuration diagram may be illustrated as anexample, and is not limited thereto.

In the lens, a first surface refers to a relatively closer surface to anobject side (or an object-side surface), and a second surface refers toa relatively closer surface to an image side (or an image-side surface).In this specification, numerical values regarding radii of curvature ofa lens, thickness of a lens, distance between lenses, effective apertureradius, and the like are expressed in millimeters (mm), and angles areexpressed in degrees.

In addition, in explanation of the shape of the lens, a convex shape ofone surface refers to a paraxial region of the surface being convex, anda concave shape of one surface refers to a paraxial region of thesurface being concave. Therefore, even when one surface of a lens isdescribed as a convex shape, an edge portion of the lens may be concave.Similarly, even when one surface of a lens is described as a concaveshape, an edge portion of the lens may be convex.

The paraxial region refers to a relatively very narrow region adjacentto and including an optical axis.

All lenses constituting an optical imaging system 3 according to anembodiment of the present disclosure may be made of a plastic material.

At least a portion of a first lens L1 to a fifth lens L5 constitutingthe optical imaging system 3 may have a non-circular planar shape. Forexample, the first lens L1 and the second lens L2 may be formed in anon-circular shape, and the third lens L3 to the fifth lens L5 may beformed in a circular shape.

Effective radius of the non-circular lens may be formed larger thaneffective radius of the other lenses.

Effective aperture radius refers to radius of one surface (anobject-side surface and an image-side surface) of a lens through whichlight actually passes. For example, the effective radius refers toradius of an optical portion of a lens.

Since the first lens L1 may be non-circular, effective radius of thefirst lens L1 may have the maximum effective radius (half of a relativelong axis (c)) and the minimum effective radius (half of a relativeshort axis (d)). In this specification, effective radius of anon-circular lens refers to the maximum effective radius.

A plurality of lenses may have at least one non-spherical surface,respectively.

For example, at least one of a first surface and a second surface of thefirst lens L1 to the fifth lens L5 may be a non-spherical surface. Here,the non-spherical surface of the first lens L1 to the fifth lens L5 maybe expressed by Equation 1.

$\begin{matrix}{Z = {\frac{{cY}^{2}}{1 + \sqrt{1 - {\left( {1 + K} \right)c^{2}\mspace{14mu} Y^{2}}}} + {AY}^{4} + {BY}^{6} + {CY}^{8} + {DY}^{10} + {{EY}^{12}\mspace{14mu} \ldots}}} & {{Equation}\mspace{14mu} 1}\end{matrix}$

In Equation 1, c is a curvature of a lens (an inverse of a radius ofcurvature of the lens), K is a conic constant, Y is a distance from acertain point on a non-spherical surface of the lens to an optical axisof the lens. Further, A to E are non-spherical constants. In addition, Z(or sag) is a distance from a certain point on the non-spherical surfaceof the lens to an apex of the non-spherical surface of the lens in anoptical axis direction.

An optical imaging system comprised of a first lens L1 to a fifth lensL5 may have positive/negative/positive/negative/positive refractivepower from an object side in sequence, or may havepositive/negative/positive/positive/positive refractive powers from anobject side in sequence.

An optical imaging system 3 according to an embodiment of the presentdisclosure satisfies at least one of the following ConditionalExpressions.

f/IMG HT>4.9   [Conditional Expression 9]

0.8<TTL/f<1.2   [Conditional Expression 10]

1.3<TTL/BFL<3.3   [Conditional Expression 11]

0.75<f12/f<4.5   [Conditional Expression 12]

3.8<f/TD12<7   [Conditional Expression 13]

ER11/ER_max>1.1   [Conditional Expression 14]

ER11/ER51>1.1   [Conditional Expression 15]

ER21/ER_max>1.0   [Conditional Expression 16]

ER21/ER51>1.0   [Conditional Expression 17]

CRA_max<18   [Conditional Expression 18]

In the Conditional Expressions, IMG HT refers to one-half of a diagonallength of the imaging plane of the image sensor, and TTL refers to adistance from the object-side surface of the first lens to an imagingplane of the image sensor.

f refers to the total focal length of the optical imaging system, andBFL refers to a distance along the optical axis from the image-sidesurface of the lens, disposed closest to the image sensor, to theimaging plane of the image sensor.

f12 refers to a combined focal length of the first lens and the secondlens, and TD12 refers to a distance along the optical axis from theobject-side surface of the first lens to the image-side surface of thesecond lens.

ER11 refers to effective radius of the object-side surface of the firstlens, ER21 refers to effective radius of the object-side surface of thesecond lens, and ER51 refers to effective radius of the object-sidesurface of the lens, disposed closest to the image sensor.

ER_max refers to a maximum value among effective radius of theobject-side surface and effective radius of the image-side surface ofthe lenses, except for the first lens and the second lens.

CRA_max refers to a maximum value of an incident angle on an imagingplane of a chief ray.

The optical imaging system 3 may improve aberration improvingperformance, because a plurality of lenses perform an aberrationcorrecting function.

In addition, an optical imaging system 3 according to an embodiment ofthe present disclosure may have a telephoto ratio (TTL/f) of greaterthan 0.8 and smaller than 1.2, and thus may have a feature of atelephoto lens, and may realize a relative narrow angle of view.

An example of the first embodiment of the optical imaging system 3 willbe described with reference to FIGS. 9 to 11.

The first embodiment of the optical imaging system 3 includes a firstlens 110, a second lens 120, a third lens 130, a fourth lens 140, and afifth lens 150.

In FIG. 9, reference numeral 160 denotes an infrared light blockingfilter, and reference numeral 170 denotes an image sensor.

Characteristics of a lens (a radius of curvature of a lens, a thicknessof a lens, distance between lenses, a refractive index, an Abbe number,an effective aperture radius, and the like) are illustrated in Table 7.

The total focal length of the optical imaging system 3 is 15.0027 mm.

TABLE 7 Effective Surface Radius of Thickness or Refractive AbbeAperture Focal No. Curvature Distance Index No. Radius Length PrismInfinity 4.500 1.7174 29.50 Prism Infinity 1.100 S1 1^(st) Lens4.3621786 1.850 1.5315 55.66 2.720 6.314838 S2 −12.93311 0.030 2.529 S32^(nd) Lens 34.873195 1.250 1.6150 25.96 2.434 −5.09605 S4 2.8598421.020 1.934 S5 3^(rd) Lens 4.0779478 0.650 1.6707 19.24 1.867 7.923147S6 15.773482 0.030 1.832 S7 4^(th) Lens 8.2367262 0.450 1.6150 25.961.812 −6.284906 S8 2.5915903 0.970 1.700 S9 5^(th) Lens 3.238378 1.1001.5441 56.11 1.800 10.835083 S10 6.2892061 5.670 1.788 S11 FilterInfinity 0.110 1.5167 64.17 S12 Infinity 1.848 S13 Imaging PlaneInfinity 0.002

In the first embodiment of the optical imaging system 3, the first lens110 has positive refractive power, and a first surface and a secondsurface of the first lens 110 are convex in the paraxial region.

A focal length of the first lens 110 is shorter than half of the totalfocal length, and larger than the absolute value of the focal length ofthe second lens 120.

The second lens 120 has negative refractive power, a first surface ofthe second lens 120 is convex in the paraxial region, and a secondsurface of the second lens 120 is concave in the paraxial region.

The third lens 130 has positive refractive power, a first surface of thethird lens 130 is convex in the paraxial region, and a second surface ofthe third lens 130 is concave in the paraxial region.

The fourth lens 140 has negative refractive power, a first surface ofthe fourth lens 140 is convex in the paraxial region, and a secondsurface is concave in the paraxial region.

The fifth lens 150 has positive refractive power, a first surface of thefifth lens 150 is convex in the paraxial region, and a second surface isconcave in the paraxial region. In addition, in a region except for theparaxial region, the first surface of the fifth lens 150 is convex, andthe second surface is concave.

Surfaces of the first lens 110 to the fifth lens 150 have anon-spherical surface coefficient as illustrated in Table 8,respectively. For example, the object-side surface and the image-sidesurface of the first lens 110 to the fifth lens 150 are allnon-spherical surfaces.

TABLE 8 S1 S2 S3 S4 S5 K −0.69940346 0.00000000 0.00000000 0.000000000.00000000 A 0.00098243 0.00228031 −0.00561997 −0.01357625 −0.00988319 B0.00003611 −0.00002062 0.00075107 0.00075230 0.00132122 C −0.00000224−0.00000190 −0.00006178 −0.00022469 −0.00018361 D 0.00000110 −0.000001810.00000262 0.00005148 −0.00001354 E −0.00000013 0.00000015 0.00000005−0.00000524 0.00000825 S6 S7 S8 S9 S10 K 0.00000000 0.000000000.00000000 0.00000000 0.00000000 A −0.01112538 −0.00928940 −0.02208945−0.01176436 −0.00158719 B 0.00247984 −0.00002393 0.00034167 0.00047792−0.00043485 C −0.00037494 0.00071974 0.00094533 0.00005094 0.00014364 D0.00000356 −0.00018516 −0.00024060 0.00003078 0.00001034 E 0.000007210.00001249 0.00001173 −0.00000543 −0.00000172

Further, the thus configured optical imaging system has aberrationcharacteristics illustrated in FIGS. 10 and 11.

An example of the second embodiment of the optical imaging system 3 willbe described with reference to FIGS. 12 to 14.

The second embodiment of the optical imaging system 3 includes a firstlens 210, a second lens 220, a third lens 230, a fourth lens 240, and afifth lens 250.

In FIG. 12, reference numeral 260 denotes an infrared light blockingfilter, and reference numeral 270 denotes an image sensor.

Characteristics of a lens (a radius of curvature of a lens, a thicknessof a lens, distance between lenses, a refractive index, an Abbe number,an effective aperture radius, and the like) are illustrated in Table 9.

The total focal length of the optical imaging system 3 is 15 mm.

TABLE 9 Effective Surface Radius of Thickness or Refractive AbbeAperture Focal No. Curvature Distance Index No. Radius Length PrismInfinity 4.500 1.7174 29.50 Prism Infinity 1.100 S1 1^(st) Lens4.2592383 2.000 1.5315 55.66 2.700 6.111269 S2 −11.91603 0.030 2.473 S32^(nd) Lens 15.742026 1.000 1.6150 25.96 2.360 −4.867794 S4 2.47290480.970 1.927 S5 3^(rd) Lens 4.1575729 0.580 1.6707 19.24 1.866 11.456635S6 8.4283765 0.315 1.817 S7 4^(th) Lens −6.398984 1.200 1.6150 25.961.778 −14.64771 S8 −23.1652 0.205 1.747 S9 5^(th) Lens 2.3606603 0.5401.5441 56.11 1.800 20.653109 S10 2.7436757 6.180 1.772 S11 FilterInfinity 0.110 1.5167 64.17 S12 Infinity 1.847 S13 Imaging PlaneInfinity 0.003

In the second embodiment of the optical imaging system 3, the first lens210 has positive refractive power, and a first surface and a secondsurface of the first lens 210 are convex in the paraxial region.

A focal length of the first lens 210 is shorter than half of the totalfocal length, and larger than the absolute value of the focal length ofthe second lens 220.

The second lens 220 has negative refractive power, a first surface ofthe second lens 220 is convex in the paraxial region, and a secondsurface of the second lens 220 is concave in the paraxial region.

The third lens 230 has positive refractive power, and a first surface ofthe third lens 230 is convex in the paraxial region, and a secondsurface of the third lens 230 is concave in the paraxial region.

The fourth lens 240 has negative refractive power, a first surface ofthe fourth lens 240 is concave in the paraxial region, and a secondsurface is convex in the paraxial region.

The fifth lens 250 has positive refractive power, a first surface of thefifth lens 250 is convex in the paraxial region, and a second surface isconcave in the paraxial region. In addition, in a region except for theparaxial region, the first surface of the fifth lens 250 is convex, andthe second surface is concave.

Surfaces of the first lens 210 to the fifth lens 250 have anon-spherical surface coefficient as illustrated in Table 10,respectively. For example, the object-side surface and the image-sidesurface of the first lens 210 to the fifth lens 250 are allnon-spherical surfaces.

TABLE 10 S1 S2 S3 S4 S5 K −0.65874613 0.00000000 0.00000000 0.000000000.00000000 A 0.00102323 0.00390175 −0.01045728 −0.02483569 −0.01455378 B0.00005302 −0.00021123 0.00140151 0.00063187 0.00004749 C −0.00000137−0.00001679 −0.00008255 0.00010758 0.00014122 D 0.00000015 0.00000123−0.00000207 0.00000952 0.00010355 E −0.00000008 0.00000006 0.00000049−0.00001105 −0.00002268 S6 S7 S8 S9 S10 K 0.00000000 0.000000000.00000000 0.00000000 0.00000000 A −0.02362937 0.01763492 0.01700066−0.03479587 −0.03057826 B 0.00402142 −0.00381016 −0.00292915 0.000333900.00220673 C −0.00041442 0.00087620 0.00069200 0.00089343 0.00021229 D0.00005352 −0.00018259 −0.00004733 −0.00013588 −0.00002850 E −0.000012350.00001242 −0.00000513 −0.00000496 −0.00000284

Further, the thus configured optical imaging system has aberrationcharacteristics illustrated in FIGS. 13 and 14.

An example of the third embodiment of the optical imaging system 3 willbe described with reference to FIGS. 15 to 17.

The third embodiment of the optical imaging system 3 includes a firstlens 310, a second lens 320, a third lens 330, a fourth lens 340, and afifth lens 350.

In FIG. 15, reference numeral 360 denotes an infrared light blockingfilter, and reference numeral 370 denotes an image sensor.

Characteristics of a lens (a radius of curvature of a lens, a thicknessof a lens, distance between lenses, a refractive index, an Abbe number,an effective aperture radius, and the like) are illustrated in Table 11.

The total focal length of the optical imaging system 3 is 15 mm.

TABLE 11 Effective Surface Radius of Thickness or Refractive AbbeAperture Focal No. Curvature Distance Index No. Radius Length PrismInfinity 4.500 1.7174 29.50 Prism Infinity 1.100 S1 1^(st) Lens3.8338273 1.713 1.5315 55.66 2.700 5.652708 S2 −12.25887 0.030 2.564 S32^(nd) Lens 44.04519 0.600 1.6150 25.96 2.437 −4.504441 S4 2.61491020.692 2.043 S5 3^(rd) Lens 3.6156811 0.635 1.6707 19.24 2.030 11.731138S6 6.1517404 1.651 1.943 S7 4^(th) Lens −4.724285 0.873 1.6150 25.961.954 −25.41663 S8 −7.221338 0.551 2.060 S9 5^(th) Lens 3.1264726 0.8781.5441 56.11 2.244 32.665226 S10 3.4142292 0.721 2.164 S11 FilterInfinity 0.210 1.5167 64.17 S12 Infinity 6.425 S13 Imaging PlaneInfinity 0.001

In the third embodiment of the optical imaging system 3, the first lens310 has positive refractive power, and a first surface and a secondsurface of the first lens 310 are convex in the paraxial region.

A focal length of the first lens 310 is shorter than half of the totalfocal length, and larger than the absolute value of the focal length ofthe second lens 320.

The second lens 320 has negative refractive power, a first surface ofthe second lens 320 is convex in the paraxial region, and a secondsurface of the second lens 320 is concave in the paraxial region.

The third lens 330 has positive refractive power, a first surface of thethird lens 330 is convex in the paraxial region, and a second surface ofthe third lens 330 is concave in the paraxial region.

The fourth lens 340 has negative refractive power, a first surface ofthe fourth lens 340 is concave in the paraxial region, and a secondsurface is convex in the paraxial region.

The fifth lens 350 has positive refractive power, a first surface of thefifth lens 350 is convex in the paraxial region, and a second surface isconcave in the paraxial region. In addition, in a region except for theparaxial region, the first surface of the fifth lens 350 is convex, andthe second surface is concave.

Surfaces of the first lens 310 to the fifth lens 350 have anon-spherical surface coefficient as illustrated in Table 12,respectively. For example, the object-side surface and the image-sidesurface of the first lens 310 to the fifth lens 350 are allnon-spherical surfaces.

TABLE 12 S1 S2 S3 S4 S5 K −0.84802901 0.00000000 0.00000000 0.000000000.00000000 A 0.00049155 0.00409512 −0.00254990 −0.01303451 −0.00959157 B0.00013502 −0.00032480 0.00038632 0.00104549 0.00285694 C −0.00001219−0.00002339 −0.00007401 −0.00041592 −0.00082408 D 0.00000153 0.000003660.00000378 0.00008901 0.00012491 E −0.00000016 −0.00000010 0.00000012−0.00001150 −0.00000528 S6 S7 S8 S9 S10 K 0.00000000 0.000000000.00000000 0.00000000 0.00000000 A −0.00855112 0.01921739 0.00939560−0.02096455 −0.01743055 B 0.00352595 −0.00319561 −0.00055655 0.001241630.00083493 C −0.00115747 0.00023017 0.00004516 0.00028090 0.00032807 D0.00017027 −0.00000425 0.00000762 −0.00005890 −0.00006638 E −0.00000622−0.00000140 −0.00000201 0.00000271 0.00000382

Further, the thus configured optical imaging system has aberrationcharacteristics illustrated in FIGS. 16 and 17.

An example of the fourth embodiment of the optical imaging system 3 willbe described with reference to FIGS. 18 to 20.

The fourth embodiment of the optical imaging system 3 includes a firstlens 410, a second lens 420, a third lens 430, a fourth lens 440, and afifth lens 450.

In FIG. 18, reference numeral 460 denotes an infrared light blockingfilter, and reference numeral 470 denotes an image sensor.

Characteristics of a lens (a radius of curvature of a lens, a thicknessof a lens, distance between lenses, a refractive index, an Abbe number,an effective aperture radius, and the like) are illustrated in Table 13.

The total focal length of the optical imaging system 3 is 15 mm.

TABLE 13 Effective Surface Radius of Thickness or Refractive AbbeAperture Focal No. Curvature Distance Index No. Radius Length PrismInfinity 4.5 1.7174 29.50 Prism Infinity 1.1 S1 1^(st) Lens 4.32758871.919995918 1.5315 55.66 2.650 6.417136 S2 −14.24283 0.03 2.438 S32^(nd) Lens 24.003293 1.324753314 1.6150 25.96 2.323 −5.345015 S42.8504255 0.304478551 1.806 S5 3^(rd) Lens 4.1762363 0.518489229 1.651021.50 1.794 20.16047 S6 5.7942522 0.780509145 1.703 S7 4^(th) Lens−4.278197 1.014658069 1.6150 25.96 1.732 355.86708 S8 −4.5777650.54918409 1.929 S9 5^(th) Lens 4.5763314 0.920607 1.5441 56.11 2.015122.96738 S10 4.5618452 0.705268963 2.021 S11 Filter Infinity0.153103832 1.5167 64.17 S12 Infinity 6.776811177 S13 Imaging PlaneInfinity 0.002141648

In the fourth embodiment of the optical imaging system 3, the first lens410 has positive refractive power, and a first surface and a secondsurface of the first lens 410 are convex in the paraxial region.

A focal length of the first lens 410 is shorter than half of the totalfocal length, and larger than the absolute value of the focal length ofthe second lens 420.

The second lens 420 has negative refractive power, a first surface ofthe second lens 420 is convex in the paraxial region, and a secondsurface of the second lens 420 is concave in the paraxial region.

The third lens 430 has positive refractive power, a first surface of thethird lens 430 is convex in the paraxial region, and a second surface ofthe third lens 430 is concave in the paraxial region.

The fourth lens 440 has positive refractive power, a first surface ofthe fourth lens 440 is concave in the paraxial region, and a secondsurface is convex in the paraxial region.

The fifth lens 450 has positive refractive power, a first surface of thefifth lens 450 is convex in the paraxial region, and a second surface isconcave in the paraxial region. In addition, in a region except for theparaxial region, the first surface of the fifth lens 450 is convex, andthe second surface is concave.

Surfaces of the first lens 410 to the fifth lens 450 have anon-spherical surface coefficient as illustrated in Table 14,respectively. For example, the object-side surface and the image-sidesurface of the first lens 410 to the fifth lens 450 are allnon-spherical surfaces.

TABLE 14 S1 S2 S3 S4 S5 K −0.70137171 0.00000000 0.00000000 0.000000000.00000000 A 0.00099425 0.00144742 −0.00361412 −0.00576326 −0.00061021 B0.00000991 0.00000111 0.00026288 0.00010513 0.00252501 C 0.00000807−0.00001645 −0.00002419 −0.00025228 −0.00098208 D −0.00000086 0.000001610.00000362 0.00001546 0.00009614 E 0.00000001 −0.00000003 −0.000000130.00000319 0.00000325 S6 S7 S8 S9 S10 K 0.00000000 0.00000000−1.98086445 0.00000000 0.00000000 A −0.00141257 0.01071713 0.00047843−0.01467572 −0.01218616 B 0.00435104 −0.00012423 −0.00033396 0.000253910.00023194 C −0.00153789 −0.00075069 −0.00024668 −0.00002615 0.00003185D 0.00021735 0.00017268 0.00006244 0.00001984 0.00000099 E −0.00000601−0.00001289 −0.00000472 −0.00000115 0.00000003Further, the thus configured optical imaging system has aberrationcharacteristics illustrated in FIGS. 19 and 20.

An example of the fifth embodiment of the optical imaging system 3 willbe described with reference to FIGS. 21 to 23.

The fifth embodiment of the optical imaging system 3 includes a firstlens 510, a second lens 520, a third lens 530, a fourth lens 540, and afifth lens 550.

In FIG. 21, reference numeral 560 denotes an infrared light blockingfilter, and reference numeral 570 denotes an image sensor.

Characteristics of a lens (a radius of curvature of a lens, a thicknessof a lens, distance between lenses, a refractive index, an Abbe number,an effective aperture radius, and the like) are illustrated in Table 15.

The total focal length (f) of the optical imaging system 3 is 14.9712mm.

TABLE 15 Effective Surface Radius of Thickness or Refractive AbbeAperture Focal No. Curvature Distance Index No. Radius Length PrismInfinity 4.5 1.7174 29.50 Prism Infinity 1.1 S1 1^(st) Lens 4.67084231.89846332 1.5315 55.66 2.653 7.321103 S2 −21.20963 0.212169417 2.417 S32^(nd) Lens 23.99194 1.447475429 1.6150 25.96 2.261 −6.476088 S43.3601753 0.741853806 1.809 S5 3^(rd) Lens −9.931184 0.59547026 1.639223.52 1.807 13.992913 S6 −4.841635 0.261488293 1.802 S7 4^(th) Lens−3.222737 0.671314943 1.6150 25.96 1.810 −18.16407 S8 −4.8745880.114264479 1.962 S9 5^(th) Lens 3.5284184 1.341138278 1.5441 56.112.050 26.366731 S10 4.0767714 1 1.972 S11 Filter Infinity 0.21 1.516764.17 S12 Infinity 7.003334369 S13 Imaging Plane Infinity 0.002867186

In the fifth embodiment of the optical imaging system 3, the first lens510 has positive refractive power, and a first surface and a secondsurface of the first lens 510 are convex in the paraxial region.

A focal length of the first lens 510 is shorter than half of the totalfocal length, and larger than the absolute value of the focal length ofthe second lens 520.

The second lens 520 has negative refractive power, a first surface ofthe second lens 520 is convex in the paraxial region, and a secondsurface of the second lens 520 is concave in the paraxial region.

The third lens 530 has positive refractive power, a first surface of thethird lens 530 is concave in the paraxial region, and a second surfaceof the third lens 530 is convex in the paraxial region.

The fourth lens 540 has negative refractive power, a first surface ofthe fourth lens 540 is concave in the paraxial region, and a secondsurface is convex in the paraxial region.

The fifth lens 550 has positive refractive power, a first surface of thefifth lens 550 is convex in the paraxial region, and a second surface isconcave in the paraxial region. In addition, in a region except for theparaxial region, the first surface of the fifth lens 550 is convex, andthe second surface is concave.

Surfaces of the first lens 510 to the fifth lens 550 have anon-spherical surface coefficient as illustrated in Table 16,respectively. For example, the object-side surface and the image-sidesurface of the first lens 510 to the fifth lens 550 are allnon-spherical surfaces.

TABLE 16 S1 S2 S3 S4 S5 K −0.59707661 0.00000000 0.00000000 0.000000000.00000000 A 0.00086594 0.00123613 −0.00425300 −0.00559248 0.00873119 B0.00002209 −0.00013526 0.00008918 −0.00004613 −0.00225383 C 0.00000182−0.00000604 0.00000097 0.00010802 0.00055094 D −0.00000048 0.000001080.00000134 −0.00000954 −0.00007255 E S6 S7 S8 S9 S10 K 0.000000000.00000000 −2.62067569 0.00000000 0.00000000 A 0.00081187 0.007817210.00221061 −0.00870129 −0.00311062 B −0.00002159 0.00240840 0.00026360−0.00064519 −0.00074027 C 0.00057616 −0.00048394 −0.00038910 0.000046010.00001898 D −0.00020034 −0.00005351 0.00005629 −0.00000207 0.00000729 E0.00001563 0.00001289 −0.00000200 0.00000077 −0.00000007

Further, the thus configured optical imaging system has aberrationcharacteristics illustrated in FIGS. 22 and 23.

Referring to the above embodiments, a lens assembly according to anembodiment of the present disclosure may reduce a size of the lensassembly while securing performance of the lens assembly.

The optical imaging system and the lens assembly including the opticalimaging system according to an embodiment of the present disclosure mayreduce the size of the optical imaging system and the lens assembly andimprove the performance.

While specific examples have been shown and described above, it will beapparent after an understanding of this disclosure that various changesin form and details may be made in these examples without departing fromthe spirit and scope of the claims and their equivalents. The examplesdescribed herein are to be considered in a descriptive sense only, andnot for purposes of limitation. Descriptions of features or aspects ineach example are to be considered as being applicable to similarfeatures or aspects in other examples. Suitable results may be achievedif the described techniques are performed in a different order, and/orif components in a described system, architecture, device, or circuitare combined in a different manner, and/or replaced or supplemented byother components or their equivalents. Therefore, the scope of thedisclosure is defined not by the detailed description, but by the claimsand their equivalents, and all variations within the scope of the claimsand their equivalents are to be construed as being included in thedisclosure.

What is claimed is:
 1. An optical imaging system comprising: a firstlens; a second lens; a third lens; a fourth lens; and a fifth lens,sequentially disposed from an object side, wherein the first to fifthlenses are spaced apart from each other by predetermined distances alongan optical axis in a paraxial region, wherein the first lens comprises anon-circular shape when viewed in an optical axis direction, and whereinthe optical imaging system satisfies 1.607 mm<ZS1<2.014 mm, where ZS1 isa ratio of an area of an object-side surface of the first lens to adistance on the optical axis from the object-side surface of the firstlens to an imaging plane of an image sensor.
 2. The optical imagingsystem according to claim 1, wherein the second lens comprises anon-circular shape when viewed in the optical axis direction, andwherein the optical imaging system further satisfies 1.838 mm<ZS2<2.303mm, where ZS2 is a ratio of an area of an object-side surface of thesecond lens to a distance on the optical axis from the object-sidesurface of the second lens to the imaging plane of the image sensor. 3.The optical imaging system according to claim 1, wherein the first lenscomprises a first side surface and a second side surface, eachcomprising an arc shape when viewed in the optical axis direction, and athird side surface and a fourth side surface connecting the first sidesurface and the second side surface, and wherein the optical imagingsystem further satisfies 73.9 degrees<α<106.4 degrees, where α is anangle between a first imaginary line connecting the optical axis and aconnection point between the first side surface and the fourth sidesurface and a second imaginary line connecting the optical axis and aconnection point between the second side surface and the fourth sidesurface.
 4. The optical imaging system according to claim 3, wherein theoptical imaging system further satisfies 0.599<AR<0.799, where a linesegment connecting the third side surface and the fourth side surfacethrough the optical axis in a shortest distance represents a minor axis,a line segment connecting the first side surface and the second sidesurface through the optical axis and perpendicular to the minor axisrepresents a major axis, and AR is a ratio of a length of the minor axisto a length of the major axis.
 5. The optical imaging system accordingto claim 1, wherein the first lens comprises an optical portion forrefracting light and a flange portion extending along a periphery of atleast a portion of the optical portion, and wherein the optical imagingsystem satisfies 1.218 mm<ZS′1<1.477 mm, where ZS′1 is a ratio of anarea of the optical portion on an object-side surface of the first lensto a distance on the optical axis from the object-side surface of thefirst lens to an imaging plane of the image sensor.
 6. The opticalimaging system according to claim 5, wherein the optical portion of thefirst lens comprises a first edge and a second edge, each comprising anarc shape when viewed in the optical axis direction, and a third edgeand a fourth edge connecting the first edge and the second edge, andwherein the optical imaging system further satisfies 61.6degrees<α′1<97.5 degrees, where α′1 is an angle between a firstimaginary line connecting the optical axis and a connection pointbetween the first edge and the fourth edge and a second imaginary lineconnecting the optical axis and a connection point between the secondedge and the fourth edge.
 7. The optical imaging system according toclaim 6, wherein the optical imaging system further satisfies0.659<AR′1<0.859, where a line segment connecting the third edge and thefourth edge through the optical axis in a shortest distance represents aminor axis, a line segment connecting the first edge and the second edgethrough the optical axis and perpendicular to the minor axis representsa major axis, and AR′1 is a ratio of a length of the minor axis to alength of the major axis.
 8. The optical imaging system according toclaim 5, wherein the second lens comprises an optical portion forrefracting light and a flange portion extending along a periphery of atleast a portion of the optical portion, and wherein the optical imagingsystem further satisfies 1.221 mm<ZS′2<1.404 mm, where ZS′2 is a ratioof an area of the optical portion on an object-side surface of thesecond lens to a distance on the optical axis from the object-sidesurface of the second lens to the imaging plane of the image sensor. 9.The optical imaging system according to claim 8, wherein the opticalportion of the second lens comprises a first edge and a second edge,each comprising an arc shape when viewed in the optical axis direction,and a third edge and a fourth edge connecting the first edge and thesecond edge, and wherein the optical imaging system further satisfies34.7 degrees<α′2<82.0 degrees, where α′2 is an angle between a firstimaginary line connecting the optical axis and a connection pointbetween the first edge and the fourth edge and a second imaginary lineconnecting the optical axis and a connection point between the secondedge and the fourth edge.
 10. The optical imaging system according toclaim 9, wherein the optical imaging system further satisfies0.755<AR′2<0.955, where a line segment connecting the third edge and thefourth edge through the optical axis in a shortest distance represents aminor axis, a line segment connecting the first edge and the second edgethrough the optical axis and perpendicular to the minor axis representsa major axis, and AR′1 is a ratio of a length of the minor axis to alength of the major axis.